Microsoft 365 Alert – Service Degradation – Microsoft Copilot (Microsoft 365) – Users’ Copilot for Sales add-in may not appear on Outlook mobile and Outlook for Mac clients – ONGOING
17/03/2026 08:47:00 AM
NHSmail Reference: INC46774733
Microsoft Reference: CP1253444
Issue Status: ONGOING
Issue Description: Users’ Copilot for Sales add-in may not appear on Outlook mobile and Outlook for Mac clients.
More info: This event is related to a known issue with Microsoft Office add-ins, as explained in the following public documentation under “ISSUE: Intermittent failure to load or deploy Office Add-ins due to Exchange authentication changes”:
Current Update: 01/04/2026 08:50:00 AM– Microsoft are continuing to analyze collected service logs alongside support provided data from impacted users to determine their next troubleshooting steps. Due to multiple concurrent add-in functionality issues currently under investigation, this is taking additional time to complete.
Scope of impact: Some users attempting to view their Copilot for Sales add-in on Outlook mobile and Outlook for Mac clients may be impacted. This section may be updated as our investigation continues.
Root cause: A portion of infrastructure responsible for the functionality of the Copilot for Sales add-in on Outlook mobile and Outlook for Mac clients isn’t processing requests as efficiently as expected and is resulting in impact.
Next update by: Wednesday, April 1, 2026, at 9:00 PM UTC
