Hi Torgeb,
Under this situation, I suggest you delete the domain and re-add it again with PowerShell, if there is no important service associated with this domain in Office 365.
You can follow the steps below:
1. Make sure you have installed Microsoft Online Services Module for Windows PowerShell. Please refer to this article for more information: Use
Windows Powershell to manage Office 365.
2. Open Windows PowerShell by opening the link on your desktop "Microsoft Online Services Module for Windows PowerShell".
3. Load the module for Microsoft Online Services into PowerShell by typing "import-module MSOnline".
4. Connect to your Office 365 Service by typing "connect-msolservice" in the command module and press ‘Enter’.
5. Submit your administrator login details for your Office 365 account into the dialog box that appears. These are the same details you use to login as an administrator on the Office 365 portal in your browser.
6. Delete the domain by using "Remove-MsolDomain" cmdlet, like so: Remove-MsolDomain -DomainName xxx.com
7. Add the domain to your account by using the "New-MsolDomain" cmdlet, like so: New-MsolDomain -Name xxx.com
8. Get the TXT record to verify, like so: Get-MsolDomainVerificationDns -DomainName xxx.com -mode DnsTxtRecord
9. Add the TXT record (you got it from step 8) to your domain, and then verify the domain by using Confirm-MsolDomain -DomainName yourdomainname.com
10. Close Windows PowerShell, and then check it again in the Office 365 Portal.
Thanks,
Edward Qu