I am trying to setup Teams for a customer of ours (.@custname1.com) but it seems that I cannot for some reason.
When I do it gives me the error that " hasn't been added to your organization's directory. Or contact Admin or try a different email""
Now I had done this this way for a 3rd customer(.@custname2.com) and it went OK.
I did find out that (.@custname1.com) is a guest in someone's else's Teams.
But the customer of custname1.com wants Teams themselves so they can use it as well. Would that be the reason why I cannot set it up for them?
I searched past posts from this community and found a couple that should address your questions: