Using existing door bell wiring

I just installed Ring Video Door Bell 2. It is wired using the wires from my previous door bell. When I touch the two existing wires together, the old door bell system will chime, so I am sure there is power there. However, when I push the ring door bell button, the old chime does not activate. I would think that pushing the ring button makes a connection across the two terminals of the ring - but then why does my chime not sound? Also, the app shows I am on battery power while it is wired. I have tried all wiring combinations with the supplied diode - no difference in any configuration. Any ideas?