01/08/2022 14:21:00 PM (BST)
Microsoft Reference : EX408287
NHSmail Reference : INC30856245
Issue Status : RESOLVED
Issue Description : Admins may be intermittently unable to access the Exchange admin center.
More info : This was specific to the Modern EAC User Experience –https://admin.exchange.microsoft.com/#/
Microsoft received reports that admins may have been able to access the classic EAC via https://outlook.office365.com/ecp/?form=eac as a workaround. However, the classic EAC user experience does have limited functionality. Additionally, as an alternative, admins could leverage Remote PowerShell.
Scope of impact : Impact was specific to some admins attempting to access the EAC who were served through the affected infrastructure.
Final Update : 02/08/2022 12:26:00 PM – Microsoft’s monitoring and testing indicates that the change to alternate CDN infrastructure has successfully restored admins’ service access.
Root cause : Recent actions to migrate EAC traffic to Microsoft OneCDN inadvertently caused the Microsoft 365 admin center to drop support for pre-OneCDN package bundles, causing intermittent connection issues for users accessing the EAC modern user experience.
Next steps : Microsoft are preparing an additional update to restore pre-OneCDN package bundles