Microsoft 365 Alert – Service Degradation – Microsoft Teams – Some users can’t get some calendar information through Graph APIs and receive a 500 error – RESOLVED

Announcements Sourav Nandi

04/06/2025 10:05:00 AM

NHSmail Reference: INC46546235

Microsoft Reference: TM1087575

Issue Status: RESOLVED

Issue Description: Some users can’t get some calendar information through Graph APIs and receive a 500 error.

More info: Impact is specific to users who have added a shared consumer mailbox to their calendar.

Final Update: 09/06/2025 08:45:00 AM – Microsoft have determined that this issue is a duplicate of another event. Please look for further updates in MO1089340. This communication will expire in 24 hours.

Scope of impact: Your organization is affected by this event, and some users attempting to get calendar information through Graph APIs are impacted.

Root cause: A change for Skype service deprecation introduced a conflict within the code leveraged during the retrieval of some calendar information through Graph APIs, which is resulting in impact.