Microsoft 365 Alert – Service Degradation – Microsoft Teams – Users may be unable to schedule Microsoft Teams meetings through the classic Outlook desktop client – ONGOING

25/06/2026 10:02:00 AM

NHSmail Reference: INC46861210

Microsoft Reference: TM1402778

Issue Status: ONGOING

Issue Description: Users may be unable to schedule Microsoft Teams meetings through the classic Outlook desktop client.

More info: Impact is specific to Microsoft Teams version 26149.1205.4798.6437. The Teams Meeting add-in appears to be installed and enabled in classic Outlook; however, it isn’t being displayed, preventing affected users from scheduling Teams meetings directly from the Outlook ribbon.

Current Update: 25/06/2026 10:17:00 AM –Microsoft has determined that a recent service update introduced an incompatibility affecting how the Teams Meeting add-in identifies the appropriate Teams client during initialization in newly configured Outlook environments. As a result, the add-in may fail to load, preventing affected users from scheduling Microsoft Teams meetings through Outlook. They have developed a fix to address this behavior and are working to expedite its deployment. To limit additional exposure, they have stopped further rollout of the affected change while we progress deployment activities for the updated fix. They will share an estimated completion timeline when one becomes available.

Scope of impact: Users on Microsoft Teams version 26149.1205.4798.6437 and attempting to create and schedule Microsoft Teams meetings through the classic Outlook desktop client may be impacted.

Root cause: A recent service update introduced an incompatibility affecting how the Teams Meeting add-in identifies the appropriate Teams client during initialization in newly configured Outlook environments impact, resulting in impact.

Next update by: Wednesday, July 1, 2026, at 10:30 AM UTC