Users may not receive notifications when added to or removed from tags in Microsoft Teams

Title: Users may not receive notifications when added to or removed from tags in Microsoft Teams User impact: Users may have not received notifications when added to or removed from tags in Microsoft Teams. More info: This event may have also impacted notifications surrounding tag creation, deletion, or restoration. This only impacted notifications and tag operations still succeed as expected. Final status: Our fix has completed its deployment, and we've confirmed through service health telemetry that this has successfully resolved the event. Scope of impact: This event may have impacted any user, and any user may have not received notifications when added to or removed from tags in Microsoft Teams. Start time: Thursday, September 24, 2026, at 9:19 AM UTC End time: Friday, October 23, 2026, at 1:00 AM UTC Root cause: A recent update to the authentication flow contained an issue that resulted in impact to tag notifications. Next steps: - We're reviewing the responsible update to better understand what led to the error that resulted in impact and prevent similar future occurrences. This is the final update for the event.

Title: Users may not receive notifications when added to or removed from tags in Microsoft Teams User impact: Users may not receive notifications when added to or removed from tags in Microsoft Teams. More info: This event may also impact notifications surrounding tag creation, deletion, or restoration. This only impact notifications and tag operations still succeed as expected. Current status: We've developed a forward fix and validated it in our internal testing environments. We're now deploying this fix to all affected regions and monitoring the progress to ensure impact is fully resolved as expected. Scope of impact: This event may impact any user, and any user may not receive notifications when added to or removed from tags in Microsoft Teams. This information may be updated as our investigation continues. Start time: Thursday, September 24, 2026, at 9:19 AM UTC Root cause: A recent update to the authentication flow that contained the issue resulting in impact. Next update by: Monday, October 26, 2026, at 8:30 PM UTC

Title: Users may not receive notifications when added to or removed from tags in Microsoft Teams User impact: Users may not receive notifications when added to or removed from tags in Microsoft Teams. More info: This event may also impact notifications surrounding tag creation, deletion, or restoration. This only impact notifications and tag operations still succeed as expected. Current status: We're continuing our validation of a fix and will provide a remediation timeline once available. Scope of impact: This event may impact any user, and any user may not receive notifications when added to or removed from tags in Microsoft Teams. This information may be updated as our investigation continues. Start time: Thursday, September 24, 2026, at 9:19 AM UTC Root cause: A recent update to the authentication flow that contained the issue resulting in impact. Next update by: Thursday, October 22, 2026, at 8:30 PM UTC

Title: Users may not receive notifications when added to or removed from tags in Microsoft Teams User impact: Users may not receive notifications when added to or removed from tags in Microsoft Teams. More info: This event may also impact notifications surrounding tag creation, deletion, or restoration. This only impact notifications and tag operations still succeed as expected. Current status: We identified a recent update to the authentication flow that contained the issue resulting in impact. We're validating a fix to resolve this issue and will provide a remediation timeline as soon as one becomes available. Scope of impact: This event may impact any user, and any user may not receive notifications when added to or removed from tags in Microsoft Teams. This information may be updated as our investigation continues. Start time: Thursday, September 24, 2026, at 9:19 AM UTC Root cause: A recent update to the authentication flow that contained the issue resulting in impact. Next update by: Wednesday, October 21, 2026, at 8:30 PM UTC