Microsoft 365 Alert – Service Degradation – Exchange Online – Users may be intermittently unable to access the Microsoft Purview Portal or access their Exchange Online mailboxes – RESOLVED

Announcements Habiba Tabasum

25/07/2024 08:52:00 AM

NHSmail Reference: INC44593774

Microsoft Reference: MO834255

Issue Status: RESOLVED

Issue Description: Users may be intermittently unable to access the Microsoft Purview Portal or access their Exchange Online mailboxes.

More info: For Microsoft Purview Portal impact, users may experience intermittent errors, time outs, and unauthorized responses when accessing the Microsoft Purview Portal. Additionally, users” Microsoft Purview policies may be delayed when propagating.

For Exchange Online impact, affected users may be intermittently unable to access Exchange Online through any of the following connection methods:

– Outlook on the web
– Outlook desktop client
– Representational State Transfer (REST) API
– Exchange ActiveSync (EAS)

Final Update: 26/07/2024 08:39:00 AM – Microsoft confirmed that the aforementioned fix has saturated the affected infrastructure and after an extended period of monitoring, they have confirmed that impact has been remediated.

Scope of impact: Some users may intermittently be affected by this issue when attempting to access their mailboxes from any connection method in Exchange Online or when attempting to access the Microsoft Purview Portal.

Root cause: A recent update to code that facilitates memory allocation increase resulted in high Central Processing Unit (CPU) usage on a portion of SQL infrastructure, causing impact.