I have a Wyse 5010 DX0d that I am trying to get to connect to a  Microsoft broker session on a Windows Server 2016 server.  I was getting a certificate related error until I placed the certificate in the store and that issue went away.  Now when I login it just says "RD broker sign-on failed".  In looking in the Security eventlog I can actually see it connect and login so it appears to be failing at another layer of the process.  If I try just an RDP session and not a broker session it works fine.  

I have changed the server I am connecting to and pointed to a 2012 r2 server and it connects without issue to the broker session.  I have tried to match settings on the 2016 server to those of the 2012 r2 server but have not had any luck.  

Any suggestions or things to try?