Shared Mailbox permissions to security group not showing in Outlook?

Tonito Dux 836 Reputation points


we use hybrid Exchange environment and I want to give permissions for us IT admins to a shared mailbox. I enter our group and Outlook does not show this Mailbox after some time in Outlook. If I add us as users - then it works.

P.S. The group is Mail-enabled and I can see the group in O365 console with the members.

Could it be that the the groups are not supported?


Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Vasil Michev 62,161 Reputation points MVP

    Automapping only works when assigning permissions directly to users, it will not work when you assign permissions to a group.

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  1. Yuki Sun-MSFT 25,076 Reputation points

    Hi @Tonito Dux ,

    In the description part for Full Access in the official link below, it mentions that auto-mapping doesn't work for any kind of group:
    Manage permissions for recipients

    In addition, the following thread discusses a similar question, and from the information of the best response there, we can learn that Automapping doesn't work for groups:
    AutoMapping Shared Mailbox based on security group

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