MicroSoft Teams Calling Functionality Issue

Incident Report for CU Anschutz ISS and CU Denver OIT

Resolved

User impact: Users may have seen intermittent failures with some call functionality in Microsoft Teams.

More info: The issue impacted the following call functionality:
-Auto attendant
-Call queue
-Voicemail
-Call recording and transcription
-Live Events

Scope of impact: The issue potentially impacted some users in the North America region utilizing the impacted call functionality in Microsoft Teams.

Final status: We identified that a recent standard service update for Microsoft Teams was causing authentication issues with calling functionality. We updated the affected authentication components and validated through our telemetry that the failures were no longer occurring, remediating the impact.

Posted May 14, 2026 - 19:50 MDT