Forum Discussion

Copper Contributor

Nov 22, 2017

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 ...

Copper Contributor

Nov 25, 2017

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

Tony DALIBOT

Copper Contributor

Nov 27, 2017

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.

VasilMichev
MVP
Nov 27, 2017
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
- Tony DALIBOT
  Copper Contributor
  Nov 29, 2017
  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?
  - VasilMichev
    MVP
    Nov 29, 2017
    The "mail" attribute is *only* used for authentication if you have altID configured with the said attribute as replacement for UPN. In all other cases, you authenticate via UPN against any of the O365 services.