Microsoft 365 Alert – Service Degradation – Microsoft Teams – Some users may be unable to make Public Switched Telephone Network (PSTN) calls using the Microsoft Teams Android mobile – RESOLVED

Announcements Habiba Tabasum

06/06/2023 09:17:00 AM (GMT)

NHSmail Reference : INC36234825

Microsoft Reference : TM572351

Issue Status : RESOLVED

Issue Description : Users may be unable to make outbound PSTN calls using the Microsoft Teams mobile app for Android.

More info : This issue is specific to Android devices running client version 1416/1.0.02023092901/0516 only. To avoid this issue, users can manually enter the country code when making PSTN calls or leverage alternate Microsoft Teams connection methods, such as the desktop client, until this issue is resolved.

The issue doesn’t affect PSTN calls to users that are in the contacts list.

Final Update : 13/06/2023 08:43:00 AM – Microsoft confirmed their fix deployment has completed, and the latest version of the Microsoft Teams Android mobile application is now available for all users to download via the Google Play Store, remediating impact.

Scope of impact : Any Microsoft Teams Android mobile app user with client version 1416/1.0.02023092901/0516 may be unable to make outbound PSTN calls from their device.

Root cause : A code change resulted in the Microsoft Teams mobile app for Android incorrectly prepending a “+” to the dialed number, which caused the library used to normalize dialed numbers and prepend country codes to not respond properly.

Next steps : Microsoft are reviewing their change procedures to identify how impact was missed during testing and validation and better prevent similar future occurrences.