For years, Microsoft has been providing a multi-factor authentication server – initially called Phone Factor and since then renamed as Azure MFA Server – to help protecting on-premises workloads.
Over time, Azure AD MFA has been improved while it was getting easier to use Azure AD MFA to protect on-premises workloads – for example with Azure AD Application Proxy.
After having announced that Azure MFA Server will no longer be available for new deployment (July 2019), now it is time to completely deprecate Azure MFA Server.
On September 30, 2024, Azure MFA Server will no longer works, meaning the service will no longer handle MFA request.
It is now time to plan and migrate from your Azure MFA Server infrastructure to Azure AD MFA https://learn.microsoft.com/en-us/azure/active-directory/authentication/how-to-migrate-mfa-server-to-azure-mfa/