HI
1.Are you using internal CA issued certificate or public CA issued certificate for RDS roles?
2.Could you please explain your RDS architecture? Are RDCB, RDweb, RDgateway , RD session host role installed on the same VM?
3.Could you please give us an example about internal domain name and external name for your RDCB server, RDweb server, RDgateway server, RD session host server?
Using certificates in Remote Desktop Services
https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2012-r2-and-2012/dn781533(v=ws.11)
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