I tried enabling this a few years back. It worked, but there was a bug in the code which I have not seen as fixed in release notes. Essentially on a VPN connection, this config would only see or honour the default GP. If you had other GP's configured, they wouldn't apply. My scenario is all default VPN users get one policy, that's all we need which limits access to a VLAN and RDP. The next group policy is admins who should have all access. This didn't work, admins would only get the default GP. I hope this is fixed as I would like to MFA VPN ASAP.