Microsoft Teams is introducing a new admin control to block external access with Teams trial-only tenants to protect against malicious activities. The default setting will block such access 30 days after rollout, requiring admin action to allow federation with trial tenants. General availability is now, with blocking enforced from July 29, 2024. Admins should review settings and use PowerShell to configure the desired access level.
Applies to: Microsoft Teams
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).