Microsoft 365 Alert – Service Degradation – Exchange Online – Some users can’t update calendar meetings in all Exchange Online connection methods and get an error – RESOLVED

17/01/2024 08:58:00 AM

NHSMail Reference: INC40913232

Microsoft Reference: EX706078

Issue Status: RESOLVED

Issue Description: Users can’t update calendar meetings in all Exchange Online connection methods and get a “Recipient Rate Limit” error.

More info: Impact is specific to delegate users that are attempting to update calendar meetings.

As a viable workaround, users can uncheck Request Responses for large calendar meetings in Exchange Online.

Final Update: 12/02/2024 09:10:00 AM – After implementing the change to the affected environment to address the code issue, Microsoft have received confirmation from some users who initially reported the issue and monitoring our service telemetry that the impact is remediated.

Scope of impact: Impact may occur for some delegate users attempting to update Exchange Online calendar meetings.

Root cause: A subset of service infrastructure that facilitates calendar meeting updates is experiencing an impacting code issue that is preventing users from updating calendar meetings in Exchange Online.

Next steps: Microsoft are further analyzing the subset of service infrastructure that facilitates calendar meeting updates to understand how the code issue was initially introduced, to prevent similar impact from reoccurring.