MS Teams number already used?

vi
1

I have to download Teams for an important online call. I registered with the email and now they want my phone number. If I enter this, it says that this number is already in use.

It may well be that I've already created a Microsoft account on an old laptop - but if that's the case, I don't know my email from that time or anything else helpful. But should definitely have a teams account with this number by Tuesday.

Who do I turn to?

At

Since it is from Mcrosoft, maybe to Microsoft support?

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