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No option to create Org-Wide Teams in the admin center
As noted in the documentation, this is the expected behavior: https://learn.microsoft.com/en-us/microsoftteams/create-an-org-wide-team#is-there-a-way-to-create-an-organization-wide-team-other-than-using-the-teams-client
Is there a way to create an organization-wide team other than using the Teams client?
Only global admins can create an organization-wide team by using the Teams client.
The user is a global admin
The tenant has 80 at least, users
A new user was also created as an admin with a license
In all cases above, the option for org-wide teams is still not available
Another limitation is that no more than 5 org-wide teams can exist in the tenant. And again, you can only use the Teams client, no other method.