diff --git a/ui/CHANGELOG.md b/ui/CHANGELOG.md
index 5821b395bb9..dda54f1ac08 100644
--- a/ui/CHANGELOG.md
+++ b/ui/CHANGELOG.md
@@ -7,6 +7,7 @@ All notable changes to the **Prowler UI** are documented in this file.
 ### 🐞 Fixed
 
 - Compliance page now loads the most recent scan when opened from the sidebar instead of showing the "no compliance data available" alert [(#11374)](https://github.com/prowler-cloud/prowler/pull/11374)
+- Invitation links now show specific expired, no-longer-valid, and invalid-token messages based on API error responses [(#11376)](https://github.com/prowler-cloud/prowler/pull/11376)
 
 ---
 
diff --git a/ui/actions/auth/auth.test.ts b/ui/actions/auth/auth.test.ts
new file mode 100644
index 00000000000..80409dd7e37
--- /dev/null
+++ b/ui/actions/auth/auth.test.ts
@@ -0,0 +1,66 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+
+const { fetchMock } = vi.hoisted(() => ({
+  fetchMock: vi.fn(),
+}));
+
+vi.mock("next-auth", () => ({
+  AuthError: class AuthError extends Error {},
+}));
+
+vi.mock("@/auth.config", () => ({
+  signIn: vi.fn(),
+  signOut: vi.fn(),
+}));
+
+vi.mock("@/lib", () => ({
+  apiBaseUrl: "https://api.example.com/api/v1",
+}));
+
+vi.mock("@/lib/sentry-breadcrumbs", () => ({
+  addAuthEvent: vi.fn(),
+}));
+
+import { createNewUser } from "./auth";
+
+describe("auth actions", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    vi.stubGlobal("fetch", fetchMock);
+  });
+
+  it("should preserve HTTP status when user creation fails", async () => {
+    // Given
+    const apiResponse = {
+      errors: [
+        {
+          status: "400",
+          code: "invalid",
+          detail: "Invalid invitation code.",
+          source: { pointer: "/data/attributes/invitation_token" },
+        },
+      ],
+    };
+    fetchMock.mockResolvedValue(
+      new Response(JSON.stringify(apiResponse), {
+        status: 400,
+        headers: { "Content-Type": "application/json" },
+      }),
+    );
+
+    // When
+    const result = await createNewUser({
+      name: "Jane Doe",
+      email: "jane@example.com",
+      password: "TestPassword123!",
+      confirmPassword: "TestPassword123!",
+      company: "Prowler",
+      invitationToken: "invitation-token",
+      termsAndConditions: undefined,
+      isSamlMode: false,
+    });
+
+    // Then
+    expect(result).toEqual({ ...apiResponse, status: 400 });
+  });
+});
diff --git a/ui/actions/auth/auth.ts b/ui/actions/auth/auth.ts
index ca6fd2d099f..f59d0319185 100644
--- a/ui/actions/auth/auth.ts
+++ b/ui/actions/auth/auth.ts
@@ -78,7 +78,7 @@ export const createNewUser = async (formData: SignUpFormData) => {
 
     const parsedResponse = await response.json();
     if (!response.ok) {
-      return parsedResponse;
+      return { ...parsedResponse, status: response.status };
     }
 
     return parsedResponse;
diff --git a/ui/app/(auth)/invitation/_lib/invitation-errors.test.ts b/ui/app/(auth)/invitation/_lib/invitation-errors.test.ts
new file mode 100644
index 00000000000..f988eff4086
--- /dev/null
+++ b/ui/app/(auth)/invitation/_lib/invitation-errors.test.ts
@@ -0,0 +1,235 @@
+import { describe, expect, it } from "vitest";
+
+import {
+  getInvitationErrorDisplay,
+  INVITATION_ERROR_FLOW,
+  INVITATION_ERROR_MESSAGES,
+  isInvitationTokenError,
+} from "./invitation-errors";
+
+describe("getInvitationErrorDisplay", () => {
+  describe("when mapping invitation accept errors", () => {
+    it("should show expired message for token_expired responses", () => {
+      // Given
+      const response = {
+        status: 410,
+        errors: [
+          {
+            status: "410",
+            code: "token_expired",
+            detail: "The invitation token has expired and is no longer valid.",
+          },
+        ],
+      };
+
+      // When
+      const result = getInvitationErrorDisplay(
+        response,
+        INVITATION_ERROR_FLOW.ACCEPT,
+      );
+
+      // Then
+      expect(result.message).toBe(INVITATION_ERROR_MESSAGES.EXPIRED);
+      expect(result.canRetry).toBe(false);
+    });
+
+    it("should show no-longer-valid message for already accepted or revoked invitations", () => {
+      // Given
+      const response = {
+        status: 400,
+        errors: [
+          {
+            status: "400",
+            code: "invalid",
+            detail: "This invitation is no longer valid.",
+          },
+        ],
+      };
+
+      // When
+      const result = getInvitationErrorDisplay(
+        response,
+        INVITATION_ERROR_FLOW.ACCEPT,
+      );
+
+      // Then
+      expect(result.message).toBe(INVITATION_ERROR_MESSAGES.NO_LONGER_VALID);
+      expect(result.canRetry).toBe(false);
+    });
+
+    it("should show not-valid message for missing invitation tokens", () => {
+      // Given
+      const response = {
+        status: 404,
+        errors: [
+          {
+            status: "404",
+            code: "not_found",
+            detail: "Invitation is not valid.",
+          },
+        ],
+      };
+
+      // When
+      const result = getInvitationErrorDisplay(
+        response,
+        INVITATION_ERROR_FLOW.ACCEPT,
+      );
+
+      // Then
+      expect(result.message).toBe(INVITATION_ERROR_MESSAGES.NOT_VALID);
+      expect(result.canRetry).toBe(false);
+    });
+
+    it("should not allow retry for client-side malformed tokens", () => {
+      // Given
+      const response = {
+        error: "Invalid invitation token",
+      };
+
+      // When
+      const result = getInvitationErrorDisplay(
+        response,
+        INVITATION_ERROR_FLOW.ACCEPT,
+      );
+
+      // Then
+      expect(result.message).toBe(INVITATION_ERROR_MESSAGES.INVALID_FALLBACK);
+      expect(result.canRetry).toBe(false);
+    });
+  });
+
+  describe("when mapping invitation signup errors", () => {
+    it("should not identify generic data errors as invitation token errors", () => {
+      // Given
+      const error = {
+        status: "400",
+        code: "invalid",
+        detail: "Invalid request data.",
+        source: { pointer: "/data" },
+      };
+
+      // When
+      const result = isInvitationTokenError(error);
+
+      // Then
+      expect(result).toBe(false);
+    });
+
+    it("should identify invitation token field errors", () => {
+      // Given
+      const error = {
+        status: "400",
+        code: "invalid",
+        detail: "Invalid invitation code.",
+        source: { pointer: "/data/attributes/invitation_token" },
+      };
+
+      // When
+      const result = isInvitationTokenError(error);
+
+      // Then
+      expect(result).toBe(true);
+    });
+
+    it("should use generic invalid fallback for non-invitation signup errors", () => {
+      // Given
+      const response = {
+        status: 400,
+        errors: [
+          {
+            status: "400",
+            code: "invalid",
+            detail: "Invalid email address.",
+            source: { pointer: "/data/attributes/email" },
+          },
+        ],
+      };
+
+      // When
+      const result = getInvitationErrorDisplay(
+        response,
+        INVITATION_ERROR_FLOW.SIGNUP,
+      );
+
+      // Then
+      expect(result.message).toBe(INVITATION_ERROR_MESSAGES.INVALID_FALLBACK);
+      expect(result.canRetry).toBe(false);
+    });
+
+    it("should show not-valid message for signup invalid invitation tokens", () => {
+      // Given
+      const response = {
+        status: 400,
+        errors: [
+          {
+            status: "400",
+            code: "invalid",
+            detail: "Invalid invitation code.",
+            source: { pointer: "/data/attributes/invitation_token" },
+          },
+        ],
+      };
+
+      // When
+      const result = getInvitationErrorDisplay(
+        response,
+        INVITATION_ERROR_FLOW.SIGNUP,
+      );
+
+      // Then
+      expect(result.message).toBe(INVITATION_ERROR_MESSAGES.NOT_VALID);
+      expect(result.canRetry).toBe(false);
+    });
+  });
+
+  describe("when the response is unexpected", () => {
+    it("should use generic invalid fallback for unmapped invalid responses", () => {
+      // Given
+      const response = {
+        status: 400,
+        errors: [
+          {
+            status: "400",
+            code: "invalid",
+            detail: "Unexpected invalid invitation response.",
+          },
+        ],
+      };
+
+      // When
+      const result = getInvitationErrorDisplay(
+        response,
+        INVITATION_ERROR_FLOW.ACCEPT,
+      );
+
+      // Then
+      expect(result.message).toBe(INVITATION_ERROR_MESSAGES.INVALID_FALLBACK);
+      expect(result.canRetry).toBe(false);
+    });
+
+    it("should allow retry for unknown responses", () => {
+      // Given
+      const response = {
+        status: 500,
+        errors: [
+          {
+            status: "500",
+            code: "server_error",
+            detail: "Something exploded.",
+          },
+        ],
+      };
+
+      // When
+      const result = getInvitationErrorDisplay(
+        response,
+        INVITATION_ERROR_FLOW.ACCEPT,
+      );
+
+      // Then
+      expect(result.message).toBe(INVITATION_ERROR_MESSAGES.UNEXPECTED);
+      expect(result.canRetry).toBe(true);
+    });
+  });
+});
diff --git a/ui/app/(auth)/invitation/_lib/invitation-errors.ts b/ui/app/(auth)/invitation/_lib/invitation-errors.ts
new file mode 100644
index 00000000000..295035c4847
--- /dev/null
+++ b/ui/app/(auth)/invitation/_lib/invitation-errors.ts
@@ -0,0 +1,125 @@
+import type { ApiError, ApiResponse } from "@/types";
+
+const CLIENT_INVITATION_ERROR = {
+  INVALID_TOKEN: "Invalid invitation token",
+} as const;
+
+const INVITATION_ERROR_DETAIL = {
+  NO_LONGER_VALID: "This invitation is no longer valid.",
+} as const;
+
+const INVITATION_ERROR_POINTER = {
+  INVITATION_TOKEN: "/data/attributes/invitation_token",
+} as const;
+
+const INVITATION_ERROR_CODE = {
+  INVALID: "invalid",
+  NOT_FOUND: "not_found",
+  TOKEN_EXPIRED: "token_expired",
+} as const;
+
+export const INVITATION_ERROR_FLOW = {
+  ACCEPT: "accept",
+  SIGNUP: "signup",
+} as const;
+
+type InvitationErrorFlow =
+  (typeof INVITATION_ERROR_FLOW)[keyof typeof INVITATION_ERROR_FLOW];
+
+export const INVITATION_ERROR_MESSAGES = {
+  EXPIRED:
+    "This invitation has expired. Please contact your administrator for a new one.",
+  NO_LONGER_VALID:
+    "This invitation is no longer valid. Please contact your administrator for a new invitation.",
+  NOT_VALID:
+    "This invitation is not valid. Please check the link you received.",
+  INVALID_FALLBACK:
+    "This invitation is invalid. Please check the link or contact your administrator.",
+  UNEXPECTED: "Something went wrong while accepting the invitation.",
+} as const;
+
+interface InvitationErrorDisplay {
+  message: string;
+  canRetry: boolean;
+}
+
+interface InvitationErrorResponse
+  extends Pick<ApiResponse, "error" | "status"> {
+  errors?: ApiError[];
+}
+
+function getFirstError(
+  response: InvitationErrorResponse,
+): ApiError | undefined {
+  return response.errors?.[0];
+}
+
+export function isInvitationTokenError(error: ApiError): boolean {
+  return error.source?.pointer === INVITATION_ERROR_POINTER.INVITATION_TOKEN;
+}
+
+export function getInvitationErrorDisplay(
+  response: InvitationErrorResponse,
+  flow: InvitationErrorFlow,
+): InvitationErrorDisplay {
+  const firstError = getFirstError(response);
+  const code = firstError?.code;
+  const detail = firstError?.detail;
+
+  if (response.error === CLIENT_INVITATION_ERROR.INVALID_TOKEN) {
+    return {
+      message: INVITATION_ERROR_MESSAGES.INVALID_FALLBACK,
+      canRetry: false,
+    };
+  }
+
+  if (response.status === 410 && code === INVITATION_ERROR_CODE.TOKEN_EXPIRED) {
+    return {
+      message: INVITATION_ERROR_MESSAGES.EXPIRED,
+      canRetry: false,
+    };
+  }
+
+  if (
+    response.status === 400 &&
+    code === INVITATION_ERROR_CODE.INVALID &&
+    detail === INVITATION_ERROR_DETAIL.NO_LONGER_VALID
+  ) {
+    return {
+      message: INVITATION_ERROR_MESSAGES.NO_LONGER_VALID,
+      canRetry: false,
+    };
+  }
+
+  if (response.status === 404 && code === INVITATION_ERROR_CODE.NOT_FOUND) {
+    return {
+      message: INVITATION_ERROR_MESSAGES.NOT_VALID,
+      canRetry: false,
+    };
+  }
+
+  if (
+    flow === INVITATION_ERROR_FLOW.SIGNUP &&
+    response.status === 400 &&
+    code === INVITATION_ERROR_CODE.INVALID &&
+    firstError &&
+    isInvitationTokenError(firstError)
+  ) {
+    return {
+      message: INVITATION_ERROR_MESSAGES.NOT_VALID,
+      canRetry: false,
+    };
+  }
+
+  if (code === INVITATION_ERROR_CODE.INVALID) {
+    return {
+      message: INVITATION_ERROR_MESSAGES.INVALID_FALLBACK,
+      canRetry: false,
+    };
+  }
+
+  return {
+    message: INVITATION_ERROR_MESSAGES.UNEXPECTED,
+    canRetry: true,
+  };
+}
diff --git a/ui/app/(auth)/invitation/accept/accept-invitation-client.tsx b/ui/app/(auth)/invitation/accept/accept-invitation-client.tsx
index f334053b481..0ed6346de71 100644
--- a/ui/app/(auth)/invitation/accept/accept-invitation-client.tsx
+++ b/ui/app/(auth)/invitation/accept/accept-invitation-client.tsx
@@ -3,53 +3,21 @@
 import { Icon } from "@iconify/react";
 import Link from "next/link";
 import { useRouter } from "next/navigation";
-import { signOut } from "next-auth/react";
 import { useEffect, useRef, useState } from "react";
 
 import { acceptInvitation } from "@/actions/invitations";
+import {
+  getInvitationErrorDisplay,
+  INVITATION_ERROR_FLOW,
+} from "@/app/(auth)/invitation/_lib/invitation-errors";
 import { Button } from "@/components/shadcn";
 
 type AcceptState =
   | { kind: "no-token" }
   | { kind: "accepting" }
-  | { kind: "error"; message: string; canRetry: boolean; needsSignOut: boolean }
+  | { kind: "error"; message: string; canRetry: boolean }
   | { kind: "choose" };
 
-function mapApiError(status: number | undefined): {
-  message: string;
-  canRetry: boolean;
-  needsSignOut: boolean;
-} {
-  switch (status) {
-    case 410:
-      return {
-        message:
-          "This invitation has expired. Please contact your administrator for a new one.",
-        canRetry: false,
-        needsSignOut: false,
-      };
-    case 400:
-      return {
-        message: "This invitation has already been used.",
-        canRetry: false,
-        needsSignOut: false,
-      };
-    case 404:
-      return {
-        message:
-          "This invitation was sent to a different email address. Please sign in with the correct account.",
-        canRetry: false,
-        needsSignOut: true,
-      };
-    default:
-      return {
-        message: "Something went wrong while accepting the invitation.",
-        canRetry: true,
-        needsSignOut: false,
-      };
-  }
-}
-
 export function AcceptInvitationClient({
   isAuthenticated,
   token,
@@ -72,20 +40,16 @@ export function AcceptInvitationClient({
     const result = await acceptInvitation(token);
 
     if (result?.error) {
-      const { message, canRetry, needsSignOut } = mapApiError(result.status);
-      setState({ kind: "error", message, canRetry, needsSignOut });
+      const { message, canRetry } = getInvitationErrorDisplay(
+        result,
+        INVITATION_ERROR_FLOW.ACCEPT,
+      );
+      setState({ kind: "error", message, canRetry });
     } else {
       router.push("/");
     }
   }
 
-  async function handleSignOutAndRedirect() {
-    if (!token) return;
-    const callbackPath = `/invitation/accept?invitation_token=${encodeURIComponent(token)}`;
-    await signOut({ redirect: false });
-    router.push(`/sign-in?callbackUrl=${encodeURIComponent(callbackPath)}`);
-  }
-
   useEffect(() => {
     if (hasStartedRef.current) return;
     hasStartedRef.current = true;
@@ -153,15 +117,9 @@ export function AcceptInvitationClient({
             <p className="text-default-500">{state.message}</p>
             <div className="flex gap-3">
               {state.canRetry && <Button onClick={doAccept}>Retry</Button>}
-              {state.needsSignOut ? (
-                <Button variant="outline" onClick={handleSignOutAndRedirect}>
-                  Sign in with a different account
-                </Button>
-              ) : (
-                <Button asChild variant="outline">
-                  <Link href="/sign-in">Go to Sign In</Link>
-                </Button>
-              )}
+              <Button asChild variant="outline">
+                <Link href="/sign-in">Go to Sign In</Link>
+              </Button>
             </div>
           </div>
         )}
diff --git a/ui/components/auth/oss/sign-up-form.tsx b/ui/components/auth/oss/sign-up-form.tsx
index 6d971b5dabb..e18ded58453 100644
--- a/ui/components/auth/oss/sign-up-form.tsx
+++ b/ui/components/auth/oss/sign-up-form.tsx
@@ -6,6 +6,11 @@ import { useRouter } from "next/navigation";
 import { useForm, useWatch } from "react-hook-form";
 
 import { createNewUser } from "@/actions/auth";
+import {
+  getInvitationErrorDisplay,
+  INVITATION_ERROR_FLOW,
+  isInvitationTokenError,
+} from "@/app/(auth)/invitation/_lib/invitation-errors";
 import { AuthDivider } from "@/components/auth/oss/auth-divider";
 import { AuthFooterLink } from "@/components/auth/oss/auth-footer-link";
 import { AuthLayout } from "@/components/auth/oss/auth-layout";
@@ -28,7 +33,10 @@ const AUTH_ERROR_PATHS = {
   EMAIL: "/data/attributes/email",
   PASSWORD: "/data/attributes/password",
   COMPANY_NAME: "/data/attributes/company_name",
-  INVITATION_TOKEN: "/data",
+} as const;
+
+const FORM_ERROR_TYPE = {
+  SERVER: "server",
 } as const;
 
 export const SignUpForm = ({
@@ -86,31 +94,47 @@ export const SignUpForm = ({
         router.push("/sign-in");
       }
     } else {
+      const invitationTokenError = newUser.errors.find((error: ApiError) =>
+        isInvitationTokenError(error),
+      );
+
+      if (invitationToken && invitationTokenError) {
+        const { message } = getInvitationErrorDisplay(
+          { status: newUser.status, errors: [invitationTokenError] },
+          INVITATION_ERROR_FLOW.SIGNUP,
+        );
+        form.setError("invitationToken", {
+          type: FORM_ERROR_TYPE.SERVER,
+          message,
+        });
+        return;
+      }
+
       newUser.errors.forEach((error: ApiError) => {
         const errorMessage = error.detail;
         const pointer = error.source?.pointer;
         switch (pointer) {
           case AUTH_ERROR_PATHS.NAME:
-            form.setError("name", { type: "server", message: errorMessage });
+            form.setError("name", {
+              type: FORM_ERROR_TYPE.SERVER,
+              message: errorMessage,
+            });
             break;
           case AUTH_ERROR_PATHS.EMAIL:
-            form.setError("email", { type: "server", message: errorMessage });
+            form.setError("email", {
+              type: FORM_ERROR_TYPE.SERVER,
+              message: errorMessage,
+            });
             break;
           case AUTH_ERROR_PATHS.COMPANY_NAME:
             form.setError("company", {
-              type: "server",
+              type: FORM_ERROR_TYPE.SERVER,
               message: errorMessage,
             });
             break;
           case AUTH_ERROR_PATHS.PASSWORD:
             form.setError("password", {
-              type: "server",
-              message: errorMessage,
-            });
-            break;
-          case AUTH_ERROR_PATHS.INVITATION_TOKEN:
-            form.setError("invitationToken", {
-              type: "server",
+              type: FORM_ERROR_TYPE.SERVER,
               message: errorMessage,
             });
             break;
diff --git a/ui/types/components.ts b/ui/types/components.ts
index ba8cb531443..a375d6e15af 100644
--- a/ui/types/components.ts
+++ b/ui/types/components.ts
@@ -419,13 +419,15 @@ export interface SearchParamsProps {
   [key: string]: string | string[] | undefined;
 }
 
+export interface ApiErrorSource {
+  pointer?: string;
+}
+
 export interface ApiError {
   detail: string;
-  status: string;
-  source: {
-    pointer: string;
-  };
-  code: string;
+  status?: string;
+  source?: ApiErrorSource;
+  code?: string;
 }
 
 export type ApiResponse = {