Microsoft 365 Alert – Service Degradation – Exchange Online – Users may see that after selecting a meeting room when scheduling meetings, it changes from available to unavailable – ONGOING

19/03/2026 09:25:00 AM

NHSmail Reference: INC46777325

Microsoft Reference: EX1233142

Issue Status: ONGOING

Issue Description: Users may see that after selecting a meeting room when scheduling meetings, it changes from available to unavailable.

More info: While we are working to remediate the impact, admins can mitigate the issue by assigning the desired working hours and the time zone for the meeting rooms.

Current Update: 02/04/2026 08:55:00 AM – The deployment of the fix is ongoing and we’re continuing to monitor as it progresses.

Scope of impact: Any users that are trying to select a meeting room when scheduling meetings outside the room’s working hours in Exchange Online may be impacted. This information may be updated as our investigation continues.

Root cause: A recent expansion of the feature logic used to book rooms for scheduled meetings contains a code complication which automatically sets the meeting rooms’ default working hours to appear in Pacific Standard Time instead of their accurate time zone.

Next update by: Thursday, April 16, 2026, at 1:00 AM UTC