← cd ~/errors
// entra id sign-in error · app registration and tokens
AADSTS900971
No reply address
What it means
No reply address was provided.
How to fix it
Add a redirect URI to the request and the app registration.
How to investigate
- Compare what the app sends (client ID, redirect URI, scopes, tenant) with the app registration.
- Decode the token or request: the JWT and SAML decoders on this site show exactly what was sent.
- Check the app's credentials (secrets and certificates) and whether the service principal exists and is enabled in this tenant.
- Search the sign-in logs for the request ID or correlation ID from the troubleshooting details on the error page.
Tools that help
Error names and meanings follow Microsoft's error code reference. The fixes are this site's guidance.