On the RDSH server, check registry for explicit license server:
Alternatively, reboot the RDSH server.
If your Windows Server 2008 R2 Remote Desktop (RDS) grace period has expired, users will be blocked from connecting unless a valid license server is configured and activated. You can either resolve this permanently by installing or temporarily by resetting the 120-day grace period timer . Method 1: Permanent Fix (Install & Activate Licenses) windows server 2008 r2 remote desktop license expired