Forticloud WPA2 Enterprise authinication suddenly stopped working with Windows 10 devices.

I currently have four 221c APs in my office that operate using Forticloud for user authentication. Everything has been working great for the past four plus months and then suddenly last week, all my Windows 10 machines stopped being able to connect to the SSID. My Android / IOS devices don't have any issues connecting, so I'm assuming it's something Microsoft updated. 

The work around has been to direct those users to connect to an open SSID and authentication on a captured portal page. 

Is anyone else experiencing this issue? Is there a solution to resolve it?

Thanks