Some users may be unable to join town hall meetings in Microsoft Teams and are redirected to a registration page

Title: Some users may be unable to join town hall meetings in Microsoft Teams and are redirected to a registration page User impact: Users may have been unable to join town hall meetings in Microsoft Teams and were redirected to a registration page. More info: This may have occurred when organizers created and published town halls with registration disabled. Additionally, users may have found the Join option unavailable or unresponsive. While we worked to remediate the impact, affected users could have utilized their Microsoft Teams or Outlook calendars to join town hall meetings. Final status: We've confirmed that the deployment of the fix has been fully rolled out, and we've validated with our internal monitoring to confirm that the impact has been remediated. Scope of impact: Impact was specific to some users that attempted to join town hall meetings in Microsoft Teams when registration was disabled. Start time: Thursday, October 1, 2026, at 4:16 PM UTC End time: Tuesday, October 20, 2026, at 12:06 AM UTC Root cause: A recent service change introduced a code regression that incorrectly required attendee registration information when registration was disabled. As a result, the attendee Join URL was removed from the session response, and prevented users from joining affected town hall meetings. Next steps: -We're reviewing the code change that resulted in impact to better understand why it incorrectly required users to register, and prevent similar issues from taking place in the future. This is the final update for the event.

Title: Some users may be unable to join town hall meetings in Microsoft Teams and are redirected to a registration page User impact: Users may be unable to join town hall meetings in Microsoft Teams and are redirected to a registration page. More info: This may occur when organizers create and publish town halls with registration disabled. Additionally, users may find the Join option unavailable or unresponsive. While we work to remediate the impact, affected users can utilize their Microsoft Teams or Outlook calendars to join town hall meetings. Current status: While most affected users have received the fix, the complete deployment is taking longer than initially anticipated. We're continuing to monitor the deployment to ensure that the impact is remediated for all affected users. Scope of impact: Impact is specific to some users attempting to join town hall meetings in Microsoft Teams when registration is disabled. Root cause: A recent service change introduced a code regression that incorrectly requires attendee registration information when registration is disabled. As a result, the attendee Join URL is removed from the session response, preventing users from joining affected town hall meetings. Next update by: Tuesday, October 20, 2026, at 3:00 AM UTC

Title: Some users may be unable to join town hall meetings in Microsoft Teams and are redirected to a registration page User impact: Users may be unable to join town hall meetings in Microsoft Teams and are redirected to a registration page. More info: This may occur when organizers create and publish town halls with registration disabled. Additionally, users may find the Join option unavailable or unresponsive. While we work to remediate the impact, affected users can utilize their Microsoft Teams or Outlook calendars to join town hall meetings. Current status: As we verify the timeline for the offending service change and when users started to become redirected to the registration page when joining Microsoft Teams town hall meetings, we're deploying our solution. Our fix deployment timeline projects our deployment will have completed and that the impact will be remediated by our next scheduled communication update. Scope of impact: Impact is specific to some users attempting to join town hall meetings in Microsoft Teams when registration is disabled. Root cause: A recent service change introduced a code regression that incorrectly requires attendee registration information when registration is disabled. As a result, the attendee Join URL is removed from the session response, preventing users from joining affected town hall meetings. Next update by: Tuesday, October 20, 2026, at 12:00 AM UTC

Title: Some users are unable to join town hall meetings in Microsoft Teams and are redirected to a registration page User impact: Users are unable to join town hall meetings in Microsoft Teams and are redirected to a registration page. More info: This occurs when organizers create and publish town halls with registration disabled. Additionally, users find the Join option unavailable or unresponsive. Current status: We’ve completed development of the fix and successfully tested the updated build in an internal environment with the offending change removed. We’re progressing the remaining preparations required to deploy the fix to the affected environment. Once deployed, we’ll validate that the fix has remediated impact. Scope of impact: Impact is specific to some users attempting to join town hall meetings in Microsoft Teams when registration is disabled. Root cause: A recent service change has introduced a code regression that incorrectly requires attendee registration information when registration is disabled. As a result, the attendee Join URL is removed from the session response, preventing users from joining affected town hall meetings. Next update by: Monday, October 19, 2026, at 5:30 PM UTC

Title: Some users are unable to join town hall meetings in Microsoft Teams and are redirected to a registration page User impact: Users are unable to join town hall meetings in Microsoft Teams and are redirected to a registration page. More info: This occurs when organizers create and publish town halls with registration disabled. Additionally, some users may find the Join option unavailable or unresponsive. Current status: We’ve confirmed the source of the regression and are developing a code fix to remediate impact. Once the updated build is complete, we’ll test the fix within an internal environment to confirm its effectiveness before progressing with a gradual rollout to the affected environment. Scope of impact: Your organization is affected by this event, and some users attempting to join town hall meetings in Microsoft Teams with registration disabled are impacted. Root cause: A recent service change introduced a code regression that caused the attendee Join URL to be removed when registration was disabled, resulting in impact. Next update by: Monday, October 19, 2026, at 2:00 PM UTC

Title: Some users are unable to join town hall meetings in Microsoft Teams and are redirected to a registration page User impact: Users are unable to join town hall meetings in Microsoft Teams and are redirected to a registration page. More info: This occurs when organizers create and publish town halls with registration disabled. Additionally, some users may find the Join option unavailable or unresponsive. Current status: We’ve identified that a recent service change introduced a regression which removes the attendee Join URL when registration is disabled, resulting in the Join option being unavailable or unresponsive. We’re validating this finding and assessing whether reverting the change or implementing a code fix is the most appropriate mitigation to remediate impact. Scope of impact: Your organization is affected by this event, and some users attempting to join town hall meetings in Microsoft Teams with registration disabled are impacted. Root cause: A recent service change introduced a code regression that caused the attendee Join URL to be removed when registration was disabled, resulting in impact. Next update by: Monday, October 19, 2026, at 12:00 PM UTC

Title: Some users are unable to join town hall meetings in Microsoft Teams and are redirected to a registration page User impact: Users are unable to join town hall meetings in Microsoft Teams and are redirected to a registration page. More info: This occurs when organizers create and publish town halls with registration disabled. Additionally, some users may find the Join option unavailable or unresponsive. Current status: We’ve confirmed that affected town halls are successfully created and published with registration disabled as intended. However, the attendee experience isn’t honoring this setting and users continue to be directed to a registration page. We're reviewing service monitoring telemetry to isolate the root cause and determine our next troubleshooting steps. Scope of impact: Your organization is affected by this event, and some users attempting to join town hall meetings in Microsoft Teams with registration disabled are impacted. Next update by: Monday, October 19, 2026, at 10:00 AM UTC