Permission & Access Issues

Fix Exchange Admin Cannot Get Permissions for a Shared Mailbox

Bushra Parveen Oct 21, 2026 868 views

Question details

An Exchange administrator is unable to access or view delegation details for a shared mailbox.

How to Fix Exchange Admin Cannot Get Permissions for a Shared Mailbox

Product: Microsoft Exchange Online
Device & OS: not provided
Scenario: Attempting to view or manage shared mailbox delegations after a recent enterprise application or permission change.
Observed behavior: The shared mailbox delegation details disappear from the Exchange Admin Center, preventing the administrator from viewing or modifying access rights.

Before you start

Ensure you have active global administrator or Exchange administrator privileges in your Microsoft 365 tenant before attempting to modify mailbox delegation settings.

Solution 1Recommended

Manage Delegation via Microsoft 365 Admin Center

Use the Microsoft 365 Admin Center interface to review and adjust shared mailbox members and delegations directly.

Often, the modern Microsoft 365 Admin Center interface resolves UI glitches experienced in the older Exchange Admin Center when viewing delegations.

Log in to the Admin Center

Navigate to the Microsoft 365 admin center and log in with your administrator credentials.

Navigate to Shared Mailboxes

In the left-hand navigation menu, expand 'Teams & groups' and select 'Shared mailboxes'.

Select the Mailbox

Find and click on the affected shared mailbox from the list to open its properties pane.

Edit Delegation

Scroll down to the 'Delegation' section and click 'Edit' to review and modify 'Read and manage' or 'Send as' permissions.

Manage Delegation via Microsoft 365 Admin Center

Alternative Interface: If the modern view does not load the permissions, some users have reported success by switching to the classic Exchange interface temporarily.

Solution 2

Use Exchange Online PowerShell

If the graphical interface fails to show permissions, use PowerShell commands to reliably view and modify mailbox delegation.

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Frequently Asked Questions

Why did my shared mailbox permissions disappear from the Exchange Admin Center?

This issue frequently occurs after adding an enterprise application as a mailbox delegate. It can cause synchronization or UI display errors in the classic Exchange Admin Center, hiding the delegation details.

What PowerShell module is required to manage mailbox permissions?

You need to install and import the ExchangeOnlineManagement module in PowerShell to use commands like Get-MailboxPermission and Add-MailboxPermission.

Can I check who has access to a shared mailbox without PowerShell?

Yes, you can check access by navigating to the Microsoft 365 admin center > Teams & groups > Shared mailboxes, clicking on the specific mailbox, and looking under the Delegation section.

Does removing the enterprise application restore the UI visibility?

In some cases, removing the application's delegation restores visibility in the classic Exchange center, but it is generally recommended to manage these complex permissions via PowerShell or the modern Microsoft 365 Admin Center instead.

Document & File Issues