Setup: Enabled guest access in Teams Admin Center; invited external@hotmail.com and external@gmail.com to teams/meetings.

Issues: Gmail user needed Microsoft account creation; Hotmail user had empty “My Apps” (normal for guests).

Fixes: Guided sign-in, granted SharePoint “Can edit” for file access.

Admin: Managed teams/channels, assigned meeting policies, used Entra ID for guest roles.

Key Takeaway:

Guests use their own accounts (no licenses needed); SharePoint permissions control file editing.