Which email address is registered?

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New Contributor
We want to use Teams for our company.
But when I want to register, I get a message that an account already exists for our organization.
How can I find out the address with which this account was created?
6 Replies
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I believe you need to contact Microsoft and figure this out / takeover / delete this!

It might been created as someone states a trial of some of the services within M365 with that domain mailaddress

Adam
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Thanks for the answer. 
I had called Microsoft but for privacy reasons they are not allowed to give me any information about the account.

@adam deltinger 

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Can you prove you own the domain?? Ex access to dns?
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Yes, I am the owner of the domain. We have an exchange server in the company with the email addresses.
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In this case you should be able too! I’d contact them again
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In This case you should be able to then! I’d contact them again