License & Subscription Issues

Fix Exchange Online Licenses Not Being Assigned to Users

Amos Gikunda Sep 30, 2026 869 views

Question details

Users need to resolve an issue where Exchange Online Plan 2 licenses fail to stay assigned to accounts in the Microsoft 365 admin center.

How to Fix Exchange Online Licenses Not Being Assigned to Users

Product: Microsoft 365 / Exchange Online
Device & OS: not provided
Scenario: An administrator is attempting to assign Exchange Online Plan 2 licenses to specific users to grant them mailbox access.
Observed behavior: The assigned licenses appear to save successfully initially, but shortly after, the checkboxes become unchecked, leaving the users without access to their mailboxes.

Before you start

Ensure you are logged in with Global Administrator or License Administrator privileges in your Microsoft 365 tenant, and verify that you have enough available Exchange Online Plan 2 licenses.

Solution 1Recommended

Remove and Reassign the License via Microsoft 365 Admin Center

Manually force a synchronization by completely removing the license, waiting for backend updates, and reapplying it.

Sometimes the Microsoft 365 admin center experiences synchronization delays. Removing the license entirely allows the system to clear the pending state before a fresh assignment is made.

Unassign the license

Navigate to the 'Active users' page in the Microsoft 365 admin center, select the affected user, uncheck the Office 365 / Exchange Online license, and save the changes.

Wait for backend synchronization

Wait for approximately 5 to 10 minutes to ensure Microsoft's backend servers have fully processed the removal of the license.

Reassign the license

Select the user again, check the box to assign the Exchange Online Plan 2 license, and save the changes to restore mailbox access.

Synchronization Delay: It can take up to 24 hours for a newly assigned Exchange Online license to fully provision the mailbox, though it typically takes less than an hour.

Solution 2

Assign the License Using PowerShell

Use Microsoft Online Services PowerShell commands to assign the license, which can bypass graphical interface glitches.

Solution 3

Contact Microsoft Support

Escalate the issue to Microsoft Support if manual reassignment and PowerShell methods fail to resolve the unchecking issue.

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Frequently Asked Questions

Why do Exchange Online licenses uncheck themselves in the admin center?

This behavior usually indicates a provisioning conflict, a temporary Microsoft 365 backend sync issue, or an incompatibility with another license currently assigned to the user.

How do I find my AccountSkuId for PowerShell license assignment?

You can find your tenant's specific AccountSkuId by opening PowerShell, connecting via 'Connect-MsolService', and running the 'Get-MsolAccountSku' cmdlet, which will list all available licensing plans.

Will removing the license delete the user's existing mailbox data?

Removing an Exchange Online license will place the mailbox in a disconnected or soft-deleted state. As long as you reassign the license within 30 days, the mailbox and its contents will be fully restored.

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