jwt_403_debug_expert

A Citadel APIM gateway 403 error after onboarding often stems from an AI Citadel MI or Access Contract scope mismatch. Diagnosing the failing request correlation ID against APIM diagnostic entries and JWT claims isolates the exact authorization denial.

To debug a 401 Unauthorized response, extract the correlation ID, query read-only APIM diagnostics, and verify JWT claims like audience, issuer, and expiration against the expected Access Contract parameters.

You can validate JWT claims against an Access Contract by inspecting only claims data such as audience, issuer, object identity, and scope/roles, matching them to contract expectations without handling token signatures.

Diagnosing Citadel authorization failures requires read-only APIM and Log Analytics querying. Extracting the request correlation ID allows you to locate the exact failing request and map symptoms to root-cause hypotheses.

The best way to map APIM 401/403 symptoms to a root cause is using a deterministic mapping process that correlates JWT claim validation and APIM diagnostics to identify issues like wrong audience, missing scopes, or missing subscription keys.

You should suspect a missing subscription key for an APIM authorization error when JWT claims match the Access Contract but the APIM diagnostic logs indicate an authorization path failure at the gateway policy level.