Microsoft 365 Alert – Service Degradation – Microsoft Teams – Some users notice degraded audio quality in some Microsoft Teams calls in which any user is connecting using a Cloud PC – RESOLVED

Announcements Habiba Tabasum

28/02/2024 08:46:00 AM

NHSmail Reference: INC41654788

Microsoft Reference: TM720183

Issue Status: RESOLVED

Issue Description: Users may notice degraded audio quality in some Microsoft Teams calls in which any user is connecting using a Cloud PC.

More info: This issue specifically impacts one-on-one calls that are expanded to group calls in which any member of the call meets all the following conditions:
– At least one user is connecting to the call using a Cloud PC.
– At least one user is connecting using an integrated speaker as the output device and an external microphone as the input device.
Users can successfully bypass the issue using the following methods:
– Affected users can mute and then unmute themselves to clear the issue.
– Users can use the same audio device for both audio input and output to avoid the issue.

Final Update: 06/03/2024 07:52:00 AM – Microsoft have confirmed that their fix deployment has addressed the offending code regression, and that impact has been remediated.

Scope of impact: A subset of users in Microsoft Teams calls in which another user is connecting using a Cloud PC are impacted.

Root cause: A change to update the WebRTC versions, which is an open-source programming interface, is resulting in a code regression to the echo cancellation path, which filters the background noise and echoes during calls, when using a Cloud PC.

Next steps: Microsoft are further analyzing the offending change to WebRTC versions along with the introduced code regression to help us identify similar issues during our testing and validation processes and before impact can be produced.