Microsoft 365 Alert – Service Degradation – Exchange Online – Some delegate users may be unable to update, or sync with, some primary calendars – FALSE POSITIVE

Announcements Sourav Nandi

19/02/2025 09:05:00 AM

NHSmail Reference: INC46455430

Microsoft Reference: EX1009662

Issue Status: FALSE POSITIVE

Issue Description: Some delegate users may be unable to update, or sync with, some primary calendars.

More info: Delegate users may be unable to update, or sync with, some primary calendars.

Final Update: 18/03/2025 07:35:00 AM – Microsoft have determined that this issue is a duplicate of another event. Please look for further updates in EX1010087.

Scope of impact: Some delegate users may be affected and may be unable to update, or sync with, some primary calendars.

Root cause: A recent change to our traffic management mechanism, which is intended to prevent impact to underlying services supporting this functionality, is resulting in impact.