Team owner, member, and guest capabilities:

https://support.microsoft.com/en-us/office/team-owner-member-and-guest-capabilities-in-microsoft-teams-d03fdf5b-1a6e-48e4-8e07-b13e1350ec7b


Add Guests:

https://support.microsoft.com/en-us/office/add-guests-to-a-team-in-microsoft-teams-fccb4fa6-f864-4508-bdde-256e7384a14f


Set Permissions:

https://support.microsoft.com/en-us/office/set-guest-permissions-for-channels-in-microsoft-teams-4756c468-2746-4bfd-a582-736d55fcc169



Teams settings and policies reference:

https://learn.microsoft.com/en-us/microsoftteams/settings-policies-reference#meetings



Understand B2B guest user properties:

https://learn.microsoft.com/en-us/entra/external-id/user-properties