I still cannot delete the domain.
There are no distribution groups setup.
The only remaining account is the O365 Global admin account, and it has no licenses or associated e-mail or proxy addresses.
I have followed the video and the online articles and all of those things have been checked and tried.
I am going to be cancelling this P1 O365 account. BUT ... I don't want to assume that when I close down the account, that the vanity domain will be automatically released. My feeling is that it will still be tied to the dead account for X number of days. And if I had to guess, I think it will be 30 days.
I need to make sure I can remove the vanity domain by end of this week at the latest. We need to add it to a separate O365 E1 account for legacy purposes.
Please let me know what else I can try. I'm getting nowhere.