IKEv2 peculiarity

Subject: IKEv2 peculiarity

Good day from Singapore,

When I wanted to use Email OTP 2FA MFA, IKEv2 doesn't allow it.

When I changed from IKEv2 to IKEv1 (main mode, not aggressive), Email OTP is allowed.

I don't understand it.

IKEv2 is a newer protocol than IKEv1. Why isn't Email OTP allowed in IKEv2?

I am currently configuring IPsec road warrior VPN tunnels in Fortigate firewalls.

Regards,

Mr. Turritopsis Dohrnii Teo En Ming
Extremely Democratic People's Republic of Singapore
20 Feb 2026 Friday 1.30 am Singapore Time



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