We have 2FA auth method using Radius Server for GP VPN users login.
After LDAP password authentication users receives SMS Token and when user entering the token the GP VPN again prompts for the token.
So eventually user receiving another SMS Token and when entering second token user getting authentication failed message on GP client.
For some users we have observed that the we need to enter the credentials two times when we checked in third party software also we were getting multiple logs.
Same has been observed in the Auth logs, PFA for reference.
It sounds like you are requiring 2FA for both portal and gateway. are you using the authentication override option in the portal and gateway settings...
some helpful info here...
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