I've tried looking for ways to configure these to use EAP-MSCHAPV2, which is what Windows clients are using, and we've tried manually testing that, but so far everything has failed. it worked! So, these clients do work, but only with less secure authentication methods, and not with more secure authentication methods. We tested by temporarily allowing MSCHAP-V2 to our VPN server and through Network Access Protocol, and. Our VPN setup works perfectly on Windows, but as usual, there seem to be compatability issues with Mac OS. Hence the question: SSTP VPN client for Mac OS that supports EAP-MSCHAP-v2. This is literally referred to as a 'Less secure authentication method' these days, and as we are a financial institution, I have no desire to enable that. In particular, they seem to rely on support for the insecure and obsolete mschap-v2 protocol. The reason is because they only work with insecure authentication mechanisms.

Unfortunately, we have tried those solutions and they do not work for us.

How to connect OS X Yosemite to a Windows based SSTP VPN?.There are already a few questions here about VPN clients that work on Mac OS which support SSTP:

Osx vpn clients