Microsoft 365 Alert – Service Degradation – Exchange Online – Some users may be unable to create new online meetings from shared calendar events in Exchange Online – ONGOING

01/06/2026 08:49:00 AM

NHSmail Reference: INC46838876

Microsoft Reference: EX1327187

Issue Status: ONGOING

Issue Description: Users may be unable to create new online meetings from shared calendar events in Exchange Online.

More info: Affected users can create online meetings from their personal calendars as an alternative method, and existing shared calendar events remain unaffected.

Current Update: 01/06/2026 08:49:00 AM –Microsoft has identified that a recent service update in Exchange Online introduced an issue within an authorization component of the calendar service, resulting in impact. They are developing and validating a code fix to address the issue and will provide a deployment timeline once it becomes available.

Scope of impact: Impact is specific to some users attempting to create new online meetings from shared calendar events in Exchange Online.

Root cause: A recent service update in Exchange Online introduced an issue within an authorization component of the calendar service, resulting in impact.

Next update by: Monday, June 01, 2026, at 6:00 PM UTC