Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi Ralf,
I have got the information from our relevant team. Firstly, I would confirm again whether you have followed the Self-removing steps and article below and can’t remove the domain:
- Sign in to Office 365 Portal as an Admin.
- Choose the app launcher icon App launcher button at the upper left side of the page, and then choose Admin.
- Click DOMAINS on the left pane then choose the domain need to remove.
If you have done the exactly same steps above, you would need to do some further steps to remove the domain. I have sent you the further steps in private message.
Then you also asked if you can remove the onmicrosoft.com domain in the expired tenant. For the onmicrosoft.com domains, they will be kept in Office 365 Exchange Online for at least 180 days after the tenant expiring. So if your tenant hasn’t expired for 180 days, it is not feasible to remove those onmicrosoft.com domains.
Regards,
Yang