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Fix HasNoMailboxAndNoLicenseAssigned Error in Microsoft 365
Question details
Outlook reports that the user has no mailbox or license assigned after switching to a Microsoft 365 Business Basic license.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- The admin removed an Exchange Online Plan 1 license after assigning Microsoft 365 Business Basic to a user.
- Observed behavior
- An error 'HasNoMailboxAndNoLicenseAssigned' appears because the Exchange Online feature was inadvertently left disabled within the new Business Basic license settings.
Ensure you have Microsoft 365 Global Administrator or User Administrator privileges to access and modify user license settings in the Admin Center.
Enable Exchange Online in the User's Licenses and Apps Settings
This is the primary fix for the 'HasNoMailboxAndNoLicenseAssigned' error, ensuring the user's new Microsoft 365 Business Basic license actually provides mailbox access.
When switching from a standalone Exchange Online plan to a bundle like Microsoft 365 Business Basic, the individual apps within the new bundle must be activated. If Exchange Online is unchecked during the transition, the mailbox becomes inaccessible and Outlook generates an error.
Navigate to the Microsoft 365 admin center website and log in using your administrator credentials.
Go to the 'Users' menu on the left-hand sidebar and click on 'Active users'.
Find the name of the user experiencing the Outlook error in the list and click on it to open their settings pane.
Click on the 'Licenses and apps' tab. Expand the 'Apps' section located under their assigned Microsoft 365 Business Basic license.
Scroll down and check the box next to 'Exchange Online' to enable it. Click 'Save changes' at the bottom of the pane.
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Frequently Asked Questions
Why did removing Exchange Online Plan 1 cause a mailbox error?
Removing the standalone Exchange Online Plan 1 immediately revokes mailbox access. If the newly assigned Business Basic license didn't have the 'Exchange Online' app toggled on in the apps section, the user is left without any active mailbox license, triggering the error.
How long does it take for a license change to take effect in Microsoft 365?
Typically, license changes take effect within a few minutes. However, in some cases of backend synchronization, it can take up to 24 hours for full mailbox access to be completely restored across all Microsoft 365 services.
Can I check if Exchange Online is enabled using PowerShell?
Yes, administrators can use the Microsoft Graph PowerShell module or Exchange Online PowerShell to verify a user's license status and explicitly see if the Exchange service plan is applied and active on the account.
