NPS Azure MFA working for RDWeb but not RDC

Single RDS gateway 2016.  Both RDweb and RDC point to same Gateway. We have NPS extention configured. 

When we login on to RDweb we get the MFA prompt from Ms Auth

When we log on to the same GW via RDC the logon never gets to NPS for MFA. 

I am trying to ID the issue. RDweb is aware and looks to the NPS CAP store. But RDC seem oblivious. How do these two authenticate differently? Any ideas on how to troubleshoot to ID and resolve? 

I have even remove NPS completely and rebuilt but same issue. So I am convinced the issue is w. RDC/RDGW and not the NPS/MFA side of things. 

Thanks,

SJMP