Microsoft 365 Alert – Service Restored – Microsoft Teams – Some users” calls may crash if they utilize a firewall and place calls from the Microsoft Teams desktop client – RESOLVED

17/02/2025 08:47:00 AM

NHSmail Reference: INC46452889

Microsoft Reference:  TM1005182

Issue Status: RESOLVED

Issue Description: Users” calls would crash if they utilized a firewall and placed calls from the Microsoft Teams desktop client.

More info: Affected users may have been unable to join Microsoft Teams meetings. Only users within organizations that utilize a firewall were affected.

Current Update: 17/02/2025 08:48:00 AM – Microsoft have successfully deployed the fix and have validated that service has been restored.

Scope of impact: Some users may have been unable to join Microsoft Teams meetings or may have experienced their calls crashing if they placed them from the Microsoft Teams desktop client and their organization uses a firewall.

Next steps: Microsoft have further investigating why some firewalls were blocking Microsoft Teams traffic following a recent change. They will provide a preliminary Post-Incident Report within two business days and a final Post-Incident Report within five business days.