Additional information will be provided in the admin center under MO287933. We're investigating an issue with Multi-Factor Authentication that is preventing some users from accessing Microsoft 365 services.
This issue only affect on-premises users, and cloud hosted users are not affected.' 'This issue could potentially affect any user if they leverage MFA and either Network Policy Server (NPS) or Active Directory Federation Services (ADFS) to access Microsoft 365 services. 'We've identified 503 errors from specific processing components and we're reviewing these errors to identify the source,' Microsoft explained in the admin center. Additional information will be provided in the admin center under MO287933, the company tweeted.Īccording to the company, only customers using on-premises Multi-Factor Authentication (MFA) servers are impacted by this Microsoft 365 issue, with Cloud Authentication not affected. 'We're investigating an issue with Multi-Factor Authentication that is preventing some users from accessing Microsoft 365 services. Microsoft is investigating an ongoing Multi-Factor Authentication (MFA) issue preventing some customers from logging into their Microsoft 365 accounts.