Forticlient IKEV2 on android failed

[quatrum]

I am working on establishing vpn from android device using forticlient app with no avail. However, everything works fine with windows 11 machine. 

1. Forticlient app version : 7.4.3
2. VPN type : IKEV2 (EAP-MSCHAPv2 with Certificate as authmethod)
3. Android Device: Honor MagicOS 8 (Android version 14) 

From the forticlient android, the error immediately shows "IKE authentication failed" where in fortigate debug last log says sent IKE msg (AUTH_RESPONSE).

Appreciated any help on this, thanks

[AEK]

As part of the troubleshooting, can you try without cert authentication? It is useful to try as in case it works then you can focus on the certificate authentication part.