​Microsoft is working to resolve an ongoing outage affecting Microsoft Teams users, causing delays and preventing some from accessing the service.

According to user reports on the outage-tracking platform DownDetector, this ongoing incident is causing problems when joining meetings with the Teams desktop client, accessing the Teams app, and signing in.

"Users may experience delays and failures when sending and receiving chat messages that include inline media (images, code snippets, videos)," Microsoft said in an incident report tracked under TM1233974.

"Impact is specific to some users located in Europe and United States who are served through the affected infrastructure attempting to send and receive chat messages that include inline media (images, code snippets, videos)."

While Microsoft has not disclosed how many users are affected, this ongoing issue is tagged as causing "service degradation" and has been flagged as an incident, a term that is commonly used for critical service issues with noticeable user impact.

Microsoft added that its engineers are currently reviewing service monitoring telemetry data to isolate the root cause behind the incident and to develop a remediation plan.

Microsoft is also working to resolve an incident that blocks users from joining some Microsoft Teams meetings via the "Join" button in the meeting chat (tracked as TM1231009), and another incident that prevents some users from adding (or updating) Copilot Studio agents to Microsoft Teams (TM1218513).

Another outage, also tagged as a critical service issue, took down multiple Microsoft 365 services in early October, including Microsoft Teams.

The October 2025 incident also caused Multi-Factor Authentication (MFA) issues, affecting users who tried to access Microsoft 365 services via Microsoft Entra single sign-on (SSO).

As Microsoft revealed at its 2024 Enterprise Connect conference, more than 320 million people use Teams each month.

Update February 17, 10:46 EST: One hour into the outage, Microsoft says the Teams delays and access issues have now been addressed.

"A subsection of service infrastructure, that facilitates underlying caching in Microsoft Teams, fell below our manageable service performance thresholds," Microsoft noted. "We reverted the configuration change to the last healthy version, and can confirm that impact is remediated after a period of monitoring service telemetry."