Forum Discussion
Unable to change mailbox permissions
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.
Thanks for your comments.
There are other people indicating this is an issue that Microsoft need to resolve, but just to clarify, in a hybrid environment where the mailboxes have been migrated to M365, managing delegation and permission to mailboxes should be done in Exchange Admin Centre in M365?
Just checking because some online documentation suggests you have to do it on-prem using powershell which seems a bit strange?
Just to clarify, these are the errors we get:
When trying to edit permissions in M365 we either get:
Or if we try in powershell we get:
Get-EXOMailboxPermission : An error occurred while processing this request.. {"error":{"code":"Unauthorized","message":"User is not allowed to call Get-MailboxPermission","innererror":{"message":"User is not allowed to call Get-MailboxPermission","type":"Microsoft.Exchange.Admin.OData.Core.ODataServiceException","stacktrace":""