Problem statement
We suddenly started seeing failed logins for our Azure AD enterprise connection. When inspecting the log entry, you can see that the error description states the following:
The provided client secret keys for app '******************' are expired. Visit the Azure portal to create new keys for your app: https://aka.ms/NewClientSecret, or consider using certificate credentials for added security: https://aka.ms/certCreds.
Cause
This error indicates that the failure occurs on the Azure side and that the client secret keys generated within the Azure portal have expired.
Solution
The Microsoft developer forum has a post that outlines some steps you can take to renew the client secret keys and update your application: