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dbrenserv2024's avatar
dbrenserv2024
Copper Contributor
Jan 07, 2025

Unable to change mailbox permissions

Hi, We have inherited a Hybrid Exchange environment. It consists of 1 on-prem Exchange Server (Version 15.0 ‎(Build 1473.3)) and M365. All the mailboxes have been migrated to M365 and ADSync is p...
Exchange Server
hybrid
office 365
Dan_Snape's avatar
Dan_Snape
Bronze Contributor
Jan 07, 2025

In a hybrid environment, delegate permission changes should be made using the Exchange Admin Centre in M365. Not sure what the issue may be in your case, but worth logging a ticket with Microsoft to see what's going on. Doing a quick search shows that other people have had this issue and Microsoft was able to fix it on their end.

dbrenserv2024's avatar
dbrenserv2024
Copper Contributor
Jan 08, 2025

Thanks for the reply. There are other people having the similar issues.

But just to clarify, once a mailbox is migrated from on prem to M365, (even thought the hybrid setup is still in place), the permissions/delegates changes should be able to be made via the Exchange Admin Centre in M365?

I just ask because some resources say you still have to manage the mailbox in M365 from the on prem Exchange Server or the on prem Powershell console?

Thanks

  • Dan_Snape's avatar
    Dan_Snape
    Bronze Contributor
    Jan 08, 2025

    For mailboxes that have been migrated to EXO, all the settings for the mailbox need to be managed on prem (ie SMTP addresses, alias, etc), but delegate permissions are managed in EXO.

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