Resolved
The fix deployed on May 24, at 14:35 UTC has proven to resolve this incident.
Monitoring
A fix for the authentication problem has been deployed, and Cognite engineering is monitoring the system to validate that the fix addresses the problem.
Investigating
Cognite engineering is currently investigating an issue where the legacy authenticaion flows for applications are failing. The problem is observed both for legacy login and API keys. The incident does not impact authentication using OIDC.