Download the Fing app from the play store or apple store.
Scan the connected wifi network. Do you see your ring doorbell in the Fing app?
You say you saw the client in the dashboard, referring to the ring doorbell or your phone, or both?
I have a ring doorbell running on MM/MD 8.4 environment using a cluster of 7005s.
What licenses do you have on the controller? What APs are you using?