Windows Monthly Security Rollup Update Breaks TC's Ability to Connect to Remote Desktop Gateway.

Hello,

We use Wyse TC's(a mixture of C10LE, 3010 & 5010) to connect to a session host server farm that runs on Server 2012r2.

We have had to uninstall the monthly rollup from Windows Update since June 2019 on our RDG server as it causes a second log in prompt to occur on our Wyse TC's. It can not be passed even with correct credentials provided. The second prompt does not occur when someone connects to the RDG server from a Windows Desktop.

Does anyone have any ideas what may be causing the second prompt?

Thank you!
Tim