Forum Discussion
Hybrid - Calendar cross permissions
Hi, i'm deploying exchange hybrid and after migrating some users to Exchange Online, on-premise users have been asked for credentials to open Office 365 calendar users.
I verified organization ...
For hybrids, MX can point to cloud or on-prem but autodiscover should remain pointing on-prem. Have you tried the Outlook Autodiscover test on https://testconnectivity.microsoft.com/ yet? Helped me a few times while troubleshooting autodiscov issues. Last bit, can you try this regedit for one test user: https://support.microsoft.com/en-in/help/3126599/outlook-prompts-for-password-when-modern-authentication-is-enabled
I don't know if the problem could be due to sync of mail whereas UPN with AD connect. Mail user don't reflect UPN. Even a user has no calendar in its profile, it will be asked for password after migrating its mailbox to Exchange online.
If you mean that you are using alternateID, yes you can expect all sort of trouble with it. Read here: https://docs.microsoft.com/en-us/windows-server/identity/ad-fs/operations/configuring-alternate-login-id
Yes i read this document but if the UPN is not the same as th mail address, it means user will have to enter their UPN to authenticate on Skype or other online services, they can't use their mail?
