Which email address is registered?

[medadame]

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?

[#2]

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

[#3]

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 

[#4]

Can you prove you own the domain?? Ex access to dns?

[#5]

Yes, I am the owner of the domain. We have an exchange server in the company with the email addresses.

[#6]

In this case you should be able too! I’d contact them again

[#7]

In This case you should be able to then! I’d contact them again