Internal error. Password validation request timed out. We were unable to either send the authentication request to the internal Hybrid Identity Service.

Question

Users cannot authenticate anymore with the error message: Internal error. Password validation request timed out. We were unable to either send the authentication request to the internal Hybrid Identity Service.

Make sure that your on-premises Active Directory instance is available and responding to requests from the agents.

Sync agents are green and no sync errors. Sync is on and working.