Active Directory user / group sync broken

Hello,

I have a Keycloak (26.1.2) server with a user-federation from an Active-Directory.

The sync is broken, no new user or group are synced. However the sync process say it is ok “Sync of users finished successfully.0 users added, 115 users updated, 0 users removed, 0 users failed.”.
Same for the groups.

I don’t know since when the sync is broken.

How can I diagnose this ?