Microsoft 365 Alert – Service Degradation – Exchange Online – Microsoft Copilot (Power Platform) – Inactivity triggers intermittently fail – RESOLVED

Announcements Shagufta Naaz

12/05/2026 09:07:00 AM

NHSmail Reference: INC46823398

Microsoft Reference: PC1308186

Issue Status: RESOLVED

Issue Description: Microsoft Copilot Studio – Inactivity triggers intermittently fail.

More info: Cross-tenant or on-premises free/busy lookups via the Outlook Scheduling Assistant fail for attendees in a specific domain. As a result, availability consistently appears as “Unknown,” preventing effective meeting scheduling.

Final Update: 12/05/2026 09:04:00 AM– After our investigation, we identified that a recent service update contained a code misconfiguration, which affected a portion of the service infrastructure supporting inactivity trigger functionality. We reverted this change and reviewed service diagnostics to confirm that the issue has been mitigated.

Root cause: A recent service update contained a code misconfiguration, which affected a portion of the service infrastructure supporting inactivity trigger functionality.

Next update by: Microsoft are reviewing our service update procedures to avoid similar impact in the future.