SSL VPN with Fortiauthenticator MFA and AD authentication

[Salas]

Is it possible to configure Fortigate to use Fortiauthenticator with MFA and AD authentication, with NTLM v1 disabled on DC's ?

With ntlm v1 enabled everything works fine, but with v1 disabled, authentication fails with error :

Windows AD user authentication(mschap) with no token failed: AD auth error: Logon failure (0xc000006d)

Login to fortiauthenticator works fine, with AD account, but when trying to login using vpn client, it fails.