Microsoft 365 Alert – Service Degradation – Microsoft Viva – Some users may see that some Viva Engage message posting operations are failing – RESOLVED

19/05/2026 08:50:00 AM

NHSmail Reference: INC46830034

Microsoft Reference: MV1315266

Issue Status: RESOLVED

Issue Description: Some users may see that some Viva Engage message posting operations are failing.

Final Update: 19/05/2026 08:49:00 AM–Microsoft has determined that a recent deployment introduced a compatibility issue between message posting operations that resulted in impact. They have deployed a code change to resolve the compatibility issue, and we’ve confirmed with internal monitoring and testing that the issue is resolved.

Scope of impact: Some users that performed Viva Engage message posting operations may have been affected.

Root cause: A recent deployment introduced a compatibility issue between message posting operations that resulted in impact.

Next steps: Microsoft are further reviewing the recent deployment to understand how the compatibility issue was introduced, and to understand what prevented it from being detected in our update testing and validation procedures, which will allow us to prevent similar issues in future deployments.