|You don't join thin clients to a domain. You join the RDP server as a member server to the domain.|
Unclear what you mean by "Licenses Required: 10"
If I count your servers correct I see 8 servers.
You would need 8 server licenses.
1 lic Domain Controller
1 lic Additional DC
1 lic Terminal Server
1 lic Rights Management Server 1
1 lic Rights Management Server 2
1 lic Data Server
1 lic Backup Data Server
1 lic Exchange Server Enterprise
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