Microsoft 365 Alert – Service Degradation – Microsoft Teams – Some users can’t sign into the Microsoft Teams desktop client with the latest version of Microsoft Teams – RESOLVED

Announcements Sourav Nandi

21/12/2022 08:55:00 AM (GMT)

NHSmail Reference : INC33402882

Microsoft Reference : TM486857

Issue Status : RESOLVED

Issue Description : Some users can’t sign in to the Microsoft Teams desktop client with the latest version of Microsoft teams.

More info : Those able to revert to a previous build report that this bypasses the issue. Additionally, users who have access to the Microsoft Teams web or mobile apps can use those connection methods to avoid this problem. Microsoft recommend users manually install the Microsoft Teams version 1.5.00.31168 as an immediate remediation action to access the Microsoft Teams desktop client. This version can be found here: https://statics.teams.microsoft.com/production-windows-x64/1.5.00.31168/Teams_windows_x64.exe.

While Microsoft continue to work on fully resolving this issue, they recommend that users periodically check their Microsoft Teams desktop client version to ensure that they’re using the aforementioned previous version. Those who have reverted their clients but are back on their current impacted build should uninstall the client and reinstall using the previous link provided, reach out to their support representative, and request that automated updates should be halted until the resolution of this event.

Scope of impact : Your organization is affected by this event and some users can’t sign in to the Microsoft Teams desktop client with the latest version of Microsoft teams.

Final Update : 18/01/2023 16:00:00 PM –Microsoft’s fix deployment has completed, and we’ve internally validated that it has addressed the offending code regression and remediated the impact.

Root Cause : The most recent Microsoft Teams desktop client update introduced a code regression inhibiting users with usernames containing a left parenthesis while omitting a right parenthesis from signing into the Microsoft Teams desktop client.

Next steps : Microsoft is further analyzing the Microsoft Teams desktop client update along with the introduced code regression to help us identify similar problems during our validation process and before they’re able to produce impact.