Unable to add domain

July 10, 2020 | by iaur | posted as Failure, Microsoft 365

Scenario

• Domain was added to a shadow tenant – this normally happens you took ownership of the domain that was added to an abandoned tenant
• The domain was used for free trial such as PowerBI, Windows Store, and Microsoft flow that by extension will create a temporary tenant for the domain
• You are getting this error when you add the domain
  • <DomainName> has already been verified for your account, or for another Microsoft Online Services account.
  • Can’t verify the domain <DomainName> was already added to a different Office 365 account domain.onmicrosoft.com. Sign in to that account as an admin, and remove domain <DomainName>. Then come back here and try adding <DomainName> to this account again

Steps

“External” Admin Take Over (PowerShell)

• Connect to the desired tenant

• Create a new MSOL domain

• Generate a TXT record for domain verification

• Add the TXT on the DNS Host and wait for replication. You can check the replication of the TXT record using this tool
• Force the take over using this cmdlet

• Go back to Admin Center and check the status of the domain verification
• If persistent, you may need to contact Microsoft 365 support to get routed to their Data Protection team