When you try to verify a domain in Microsoft Office 365, you receive the following error message:
Can't verify domain
We can't verify the domain because it is associated with another Microsoft hosted service. A domain can be associated with only one service. To use this domain, first remove it from the other service, and then try again to verify the domain. If you still can't verify the domain, contact Microsoft Online Services Support to resolve the issue
This issue occurs if one of the following conditions is true:
The domain exists in another Microsoft cloud service. For example, this domain exists in Live@edu.
The domain is federated with Microsoft Exchange Online.
To resolve this issue, use one of the following methods, as appropriate for your situation.
You use your domain in Live@edu
The domain can exist only in one service. If you use the domain in Live@edu and you want to use the domain in Office 365, remove the domain from Live@edu.
You previously set up an Exchange federation trust (Exchange delegation)
If the domain exists from an Exchange federation trust that was previously set up, remove the Exchange federation trust. For more information about how to do this, go to the following Microsoft website:
If you still receive the error message, contact Live@edu Support at (800) 455-6399, and have them check whether the domain is currently provisioned or whether it's used for Exchange federation. Specifically, have Live@edu Support check the Known to Systemand Passport Namespace State values in Syndication Central.
To check whether your Office 365 account has an Exchange federation trust set up
If you previously verified your domain in your Office 365 account or in another Office 365 account, use Windows PowerShell in Exchange Online to check whether the domain is set up for an Exchange federation trust. To do this, run the following Windows PowerShell cmdlet from Exchange Online PowerShell: