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Loggin Teams
Someone has already set up teams for your organization Ask your administrator to set up teams for you, or set up another organization in teams with a different e-mail address.
Use the steps outlined here to perform a domain takeover: https://docs.microsoft.com/en-us/azure/active-directory/enterprise-users/domains-admin-takeover
This is a very common issue, please use the search functionality if you want additional details.