the mailbox reached the limit of maximum allowed access control entries

Wiktor Kostrzewski 21 Reputation points


I am unable to remove or add to shared mailbox permission any object

I got error :
How to fix this ?
I have hybrid environment

Microsoft Exchange Hybrid Management
Microsoft Exchange Hybrid Management
Microsoft Exchange: Microsoft messaging and collaboration software.Hybrid Management: Organizing, handling, directing or controlling hybrid deployments.
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Accepted answer
  1. Kael Yao-MSFT 37,676 Reputation points Microsoft Vendor

    Hi @Wiktor Kostrzewski

    Here is a link with the similar issue for your reference: Unable to add full access on shared mailbox
    As it has been mentioned in the error message "Clean existing entries and rearrange them leveraging groups for assigning the same permission to multiple users.",
    please first check if you can remove some of the delegates from the shared mailbox, then wait some time for the information to be updated, see if you can add permissions to new objects correctly.

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  1. Wiktor Kostrzewski 21 Reputation points

    I removed some entries but i still get the same error.
    I am worried if remove all, the error will persist