Microsoft 365 Alert – Service Degradation – Microsoft Teams – Users may have received failures when creating channels or adding members to shared channels in Microsoft Teams – RESOLVED

04/08/2026 08:54:00 AM

NHS.net Connect Reference: INC46899141

Microsoft Reference: TM1446653

Issue Status: RESOLVED

Issue Description: Users may have received failures when creating channels or adding members to shared channels in Microsoft Teams.

Final Update: 04/08/2026 10:07:00 AM – After a period of monitoring, Microsoft confirmed that rolling back the offending update remediated impact.

Scope of impact: Your organization was affected by this event, and some users may have received failures when creating channels or adding members to shared channels in Microsoft Teams.

Root cause: A recent service update migrated JavaScript Object Notation (JSON) deserialization behavior, resulting in scenarios that rely on deserialization to utilize incorrect values and causing users to receive failures, such as when creating channels or adding users to shared channels in Microsoft Teams.

Next Steps: To help prevent similar impact in the future, Microsoft are further reviewing their update release procedures to ensure they are able to better identify issues before changes are deployed.