Back Feeds.4Sysops Using OpenID Connect (OIDC) for external MFA in Entra ID
Microsoft has introduced external Multi-Factor Authentication (MFA) as the new, fully integrated OpenID Connect (OIDC)-based way to connect third-party MFA providers, replacing the Custom Controls mechanism that previously enabled external MFA in a more limited way. Custom Controls will be deprecated on September 30, 2026. Source
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