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Title
Enable Linked Mailbox Error: The user account "domain\username1" to be linked has already been the master account of another linked mailbox -
Description
Getting an error below when mailbox enabled for linked mailbox:
11:52:46 ERROR: [7437-1-193-00000000]Unable to enable object. Reason: 'Enable Linked Mailbox Error: The user account "domain\username1" to be linked has already been the master account of another linked mailbox "domain.com/MailUsers/username2". Choose a different user account.
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Cause
The issue is due to the Mail User object was already linked to another mailbox. -
Resolution
To check if the Mail User object was already linked to another mailbox, please follow the steps below:- Open up the Exchange Powershell cmdlet as Administrator
- Run this command "Get-User -Identity “domain\username1” | FL LinkedMasterAccount"NOTE: Make sure that the LinkedMasterAccount properties value is null.
To remove the linked mailbox from the Mail User account, please follow the steps below:
- Open up the Exchange Powershell cmdlet as Administrator
- Set-User domain\username1 -LinkedMasterAccount domain\username1 -LinkedDomainController AccountDomainControllerFQDN