You want to use RDP load balancing with RD Connection Broker, but you neither use DNS Round Robin nor NLB as a load balancing method, but Token based load balancing.
You need to find out the token string to enter in Sessions > RDP > [Your RDP Session] > Options > Load balancing routing token.
- On the thin client, log in to a RD web-access connection via the browser.
- Enter the following command in a Local Terminal:
- Look for
load-balance_info- its value begins with
tsv://. What follows is the routing token.
Further information from Microsoft: https://technet.microsoft.com/de-de/library/ff393684%28v=ws.10%29.aspx