Microsoft 365 Alert – Service Degradation – Microsoft Teams – Users may be unable to upload background images larger than 1800×1800 during Microsoft Teams meetings – RESOLVED

Announcements Sourav Nandi

28/03/2025 08:02:00 AM

NHSmail Reference: INC46488990

Microsoft Reference: TM1040294

Issue Status: RESOLVED

Issue Description: Users may be unable to upload background images larger than 1800×1800 during Microsoft Teams meetings.

More info: When attempting to upload a background image larger than 1800×1800, users receive an error message stating “invalid image size” and the upload fails. Users can avoid this issue by resizing the desired image to below the aforementioned dimensions.

Final Update: 18/04/2025 08:50:00 AM – Microsoft have confirmed that the fix has completed deployment, and after monitoring the service, they’ve verified that this action has successfully remediated the problem.

Scope of impact: This issue may affect any user attempting to upload a background image larger than 1800×1800 during any Microsoft Teams meeting.

Root cause: A recent change instituted a restriction on image size for background image uploads in Microsoft Teams.

Next steps: Microsoft are investigating how the recent change that restricted background image uploads in Microsoft Teams introduced a code regression that wasn’t caught during pre-deployment testing, and they’re working to improve their validation processes to prevent similar issues in the future.