When you try to remove a domain from Microsoft Office 365 by using Windows PowerShell, you receive the following error message:
Remove-MsolDomain : You cannot delete the default domain. Use the Set-MsolDomain cmdlet to set another domain as the default domain before you delete this domain.
At line:1 char:18
+ Remove-MsolDomain <<<< -DomainName <DomainName>
+ CategoryInfo : OperationStopped: (:) [Remove-MsolDomain], MicrosoftOnlineException
+ FullyQualifiedErrorId : Microsoft.Online.Administration.Automation.DefaultDomainDeletionException,Microsoft.Online.Administration.Automation.RemoveDomainThis issue occurs if the domain is the primary or default domain.
This issue occurs if the domain is the primary or default domain.
Important If you have Office 365 for education, do not follow the steps in this procedure. Instead, contact Office 365 Support for help to resolve this issue.
To resolve this issue, set the primary domain by editing the company profile. To do this, follow these steps:
Sign in to the Office 365 portal (https://portal.office.com) as a global administrator.
Click Admin. Then, if the Office 365 option is available, select this option.
The name of your company is displayed near the top of the page. The name of your company acts as a link to your company's profile.
Click the name of your company to see the profile.
In the profile window, click Edit.
In the Default domain box, change the domain, and then click OK.
For more information, see the following Microsoft Knowledge Base article:
2284755 You get an error message when you try to remove a domain from Office 365
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