Microsoft investigates Microsoft 365 outage affecting users, admins

Microsoft investigated and mitigated an outage that intermittently prevented some users and admins from accessing Microsoft 365 services—primarily the Admin Center, with potential impact to SharePoint Online and Exchange Online search/access. The incident, tracked under MO991872, was attributed to an erroneous configuration change; Microsoft reverted the change and confirmed resolution after monitoring. Prior, related service disruptions were noted in recent months, but this event was operational in nature rather than a security breach.