Microsoft 365 Alert – Service Degradation – Microsoft Teams – Users may have been unable open OneNote pages in Microsoft Teams channels when selecting the OneNote tab – RESOLVED

11/08/2025 09:04:00 AM

NHSmail Reference: INC46600787

Microsoft Reference: TM1132228

Issue Status: RESOLVED

Issue Description: Users may have been unable open OneNote pages in Microsoft Teams channels when selecting the OneNote tab.

More info: To bypass this issue, affected users may have been able to utilize the OneNote app directly or access the content via the file’s direct URL. Affected users may have also seen the following error message when attempting to open OneNote tabs in Teams:

“There was a problem reaching this app”.

Current Update: 11/08/2025 09:04:00 AM – Microsoft have validated in service health telemetry that our actions to complete a reversion to a version of the service that was previously completing this action have successfully alleviated this issue.

Scope of impact: Users attempting to open OneNote pages in Microsoft Teams channels when selecting the OneNote tab may have been unable to do so.

Root cause: A recent standard service version update contained a regression that was inhibiting OneNote pages in Microsoft Teams channels from opening when the OneNote tab was selected.

Next update by: Microsoft are analyzing the recent standard service version update that contained the regression to understand why this error made it past our checking process in an effort to avoid impact like this in the future.