Teams calendar not syncing with exchange on-prem calendar
Hello, I have a problem with the calendar sync between exchange online/Teams for a customer. I configured Azure AD Connect with the hybrid option and users are synced to the cloud and licensed with O365 E3. I setup exchange hybrid on an exchange server 2016 CU11 with the new version of the Hybrid Wizard, ending with the OAuth error after the first run. So I configured OAuth manually with the docs.microsoft manual and calendar sync was working, for 1 day. At the next day it wasn't working and I couldn't get it running again since then, 3 weeks ago. I checked all OAuth config elements, reastablished them individually, startet the Hybrid Wizrad several times, always ending with the OAuth error. I tested with teh test-oauthconnectivity cmdlet in both directions which ends always successfull, restarted the server and services several times, checked the availability service and with the remote connectivity analyzer for free/busy and everything was successful but sync is still not working again. Can someone help me with this issue or has tipps to chekc further? Kind Regards Julian