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website/docs: add oidc issuer information #22556

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website/docs: add oidc issuer information
PeshekDotDev May 22, 2026
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Update website/docs/add-secure-apps/providers/oauth2/index.mdx
PeshekDotDev May 22, 2026
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Update website/docs/add-secure-apps/providers/oauth2/index.mdx
PeshekDotDev May 22, 2026
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Update website/docs/add-secure-apps/providers/oauth2/index.mdx
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dominic-r May 22, 2026
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update warning to info
PeshekDotDev May 22, 2026
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Update language throughout the doc, fix punctuation and spelling
dewi-tik May 22, 2026
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19 changes: 19 additions & 0 deletions website/docs/add-secure-apps/providers/oauth2/index.mdx
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Expand Up @@ -86,6 +86,25 @@ Using back-channel logout (a server-to-server notification mechanism) allows an

For more information, see our [OAuth2/OpenID Connect front-channel and back-channel logout](./frontchannel_and_backchannel_logout.mdx) documentation.

## Issuer mode

The **Issuer mode** setting (under **Advanced protocol settings** controls the value authentik uses for the `iss` (issuer) claim in the tokens it signs, and for the `issuer` field in the provider's [OpenID Connect discovery document](#oauth2-endpoints-and-bindings).

| Mode (UI label) | `iss` value |
| ------------------------------------------------------------------------------- | ------------------------------------------------------------- |
| _Each provider has a different issuer, based on the application slug_ (default) | `https://authentik.company/application/o/<application_slug>/` |
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| _Same identifier is used for all providers_ | `https://authentik.company/` |
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By default, authentik uses per-provider mode: every provider has a unique issuer derived from its application slug. This is the recommended setting, and it matches how the discovery and JWKS endpoints are structured, since both are served under the per-application `/application/o/<application_slug>/` path.
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### Global issuer mode

Setting the issuer mode to _Same identifier is used for all providers_ (referred to internally as **global** mode) makes every OAuth2 provider on the authentik instance share the same issuer: the root URL of the instance (`https://authentik.company/`).
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:::warning
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@dominic-r dominic-r May 22, 2026

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i'd make this an :::info + adding a title

Global issuer mode still serves the discovery document at `https://authentik.company/application/o/<application_slug>/.well-known/openid-configuration`, not at the root issuer URL.
:::

## OAuth 2.0 flows and grant types

There are three general flows of OAuth 2.0:
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