VPN Client Connection Failures on Windows 11 Since This Morning — Authentication Policy Error

Problem description

I am experiencing an issue where all my Windows 11 Point-to-Site VPN clients using IKEv2 and certificate authentication cannot connect to the Azure VPN Gateway since this morning. The error message indicates a policy mismatch during authentication: "The connection was prevented because of a policy configured on your RAS/VPN server. Specifically, the authentication method used by the server to verify your username and password may not match the authentication method configured in your connection profile." I need assistance troubleshooting this connection failure.

Environment

Azure VPN Gateway Point-to-Site configuration, Tunnel type: IKEv2, Authentication: Certificate (EAP-TLS), Client OS: Windows 11, Gateway in default active-standby configuration across two instances.

What I've already tried

Tried new certificates, downloading new clients. resetting vpn

Current status

Currently, I am seeking guidance on how to diagnose and resolve the authentication policy mismatch preventing my VPN clients from connecting.