If you are syncing from on-prem, then you need to hide the mailbox on-prem via the on Exch Mgmt tools and that will sync to Azure.
Azure AD connect not syncing hide from address list in MS office 365
I have an on-prem AD but have Office 365/Azure/Entra and now I can not go into MS admin and hide from the address list. when I turn on the toggle I get "Could't update mailbox global address list info" See the screenshot below
3 answers
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Andy David - MVP 146.4K Reputation points MVP
2024-07-16T23:46:10.8833333+00:00 Did you migrate mailboxes from on-prem? Are you syncing Exch Atttributes and ad Accounts from on-prem?
If so, then you would need to manage the Exch attributes on-prem as well.
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Bruce Jing-MSFT 3,515 Reputation points Microsoft Vendor
2024-07-17T07:48:39.12+00:00 Hi,@Debbie Drummond
Thanks for posting your question in the Microsoft Q&A forum.
According to your description, this problem occurred after migrating the on-pre mailbox to Online.
Reason:
On-premises is the source of truth for users, they cannot be edited directly in O365.
Solution:
As Andy said, you need to manage the Exch attributes on-prem as well to complete the modification.
You also extend your on-premises AD schema with the Exchange attributes, then you will be able to make the changes. Alternatively, you can disable dirsync, make the changes, re-enable it.
If my answer is helpful to you, please mark it as the answer so that other users can refer to it. Thank you for your support and understanding.