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I am looking to use Teams for our company. The first step, inviting people to join, is already unclear. How do I invite people from our company to join? They all do not have a company email address. ...
Hi, you have two choices here really.
1). Setup the users with company email addresses.
2). Invite them as Guests into Teams using their private email addresses
https://docs.microsoft.com/en-us/microsoft-365/solutions/collaborate-as-team?view=o365-worldwide