sources/oauth: Fallback to id field when sub is missing in OIDC callback (#22672)

fix/oidc-callback-fallback-id-to-sub

Signed-off-by: Vlad Kamerdinerov <61966975+v-kamerdinerov@users.noreply.github.com>
Co-authored-by: Jens Langhammer <jens@goauthentik.io>

authentik/sources/oauth/types/oidc.py

@@ -67,7 +67,7 @@ class OpenIDConnectOAuth2Callback(OAuthCallback):
     client_class = OpenIDConnectClient
 
     def get_user_id(self, info: dict[str, str]) -> str:
-        return info.get("sub", None)
+        return str(info.get("sub") or info.get("id"))
 
 
 @registry.register()