I just started a new T310 and there is also 5 R500s in the LAN the new T310 says:Building the Unleashed Network. It may take a few minutes. after about 30 mins I restarted it and still says the same
Please verify if the firmware version on both Unleashed AP are same, make sure that you are running same version and the on the Master you should see this new Unleashed AP as disconnected or connected.