Forum Discussion
External Users in Teams
By default they can be added to any Team. You can however configure restrictions on the Team/Group level, so that only certain Teams/Groups can have Guests added to them. Check the documentation here: https://docs.microsoft.com/en-us/microsoftteams/teams-dependencies
And here for how to block Guests for particular Group: https://support.office.com/en-us/article/guest-access-in-office-365-groups-bfc7a840-868f-4fd6-a390-f347bf51aff6#PickTab=Manage
So if I understand correctly, if I have 300 Team sites and I have external sharing enabled and I want to block it from say 299 of those Teams.. I would have to run a powershell script on each team site?
Not necessarily, if you only want to enable Guests for 1 Team/Group, you should be able to do it the other way around. Meaning set the "global" template to disallow Guest, but configure specific Groups to allow. Still have to do it via PowerShell though :)