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How to Fix Cannot Delete an Alias from a Microsoft 365 Group

Huda Qurayshi Oct 10, 2026 868 views

Question details

The user is unable to completely remove an email alias from a Microsoft 365 Group, as it remains visible in the admin interface even after executing a deletion command.

How to Fix a Microsoft 365 Group Alias Not Deleting

Product: Microsoft 365
Device & OS: not provided
Scenario: Administering Microsoft 365 groups and attempting to delete or free up an email alias for a shared mailbox.
Observed behavior: The alias remains visible in the Microsoft 365 admin center after being removed via PowerShell, and the system reports that Unified Groups are unsupported, preventing the alias from being reused.

Before you start

Ensure you have Exchange Administrator or Global Administrator privileges in your Microsoft 365 tenant, and verify that the Exchange Online PowerShell module is properly connected.

Solution 1Recommended

Allow Directory Synchronization and Verify via PowerShell

Give the system time to sync directory changes and use Exchange Online PowerShell to verify the actual back-end status of the alias.

Often, changes made via PowerShell do not immediately reflect in the Microsoft 365 admin center due to directory synchronization delays. Verifying the actual properties using PowerShell confirms whether the deletion was successful on the server side.

Wait for directory synchronization

Allow up to 24 hours for the Azure Active Directory synchronization to fully process the alias removal across all Microsoft 365 services.

Refresh the admin center

Clear your browser cache, open a private or incognito window, and log back into the Microsoft 365 admin center to check if the alias has disappeared from the interface.

Verify EmailAddresses property

Run the command `Get-UnifiedGroup -Identity 'YourGroupName' | Select-Object -ExpandProperty EmailAddresses` in Exchange Online PowerShell. If the alias is not listed in the output, it has been successfully deleted from the system.

Allow Directory Synchronization and Verify via PowerShell

Sync Delays: Even if the PowerShell output confirms the alias is gone, the admin center UI might still display it as a 'ghost' entry until the back-end cache completely clears.

Solution 2

Request a Back-End Correction from Microsoft Support

If the alias is still visible or cannot be reassigned to a shared mailbox after 24 hours, contact Microsoft Support to fix the database mismatch.

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Frequently Asked Questions

Why does a deleted Microsoft 365 group alias still appear in the admin center?

This typically occurs due to directory synchronization delays between Exchange Online and the Microsoft 365 admin center interface. In some cases, a back-end caching glitch causes a 'ghost' entry that requires Microsoft Support to manually clear.

How long does directory synchronization take to reflect an alias deletion?

While standard directory synchronization happens approximately every 30 minutes, complex object changes like Unified Group alias deletions can occasionally take up to 24 hours to fully propagate across all Microsoft interfaces.

Can I reuse an alias immediately after deleting it?

Under normal circumstances, an alias can be reused shortly after deletion. However, if the alias is stuck in a deletion state or ghosted in the admin center, you will receive an error when attempting to assign it to another user or shared mailbox until the sync resolves or support corrects the backend.

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