Google isn't the only one.

Somebody must have used my domain to sign up for a Microsoft Teams something for some reason and NOBODY in my company can find out who or how. Microsoft is absolutely unhelpful in this regard, trying to activate our domain for Office Teams or whatever. Microsoft says it's for "security" reasons; but as CIO of a 50+ person org I should have some override on that in the event of erroneous signups.

I don't even need to access old content because none of us has used the service at all. Just delete the old domain. For all I know it was a troll signup.

I've since just forced my team to use Google Docs/Sheets because Microsoft is being so unhelpful that they won't even let us give them money, lol.