I installed a second Ring Pro doorbell device on my backdoor. The new device does not power on. I left it connected overnight and it still does not show any sign of powering on. I disconnected and reconnected, still it does not power on. The reading on my volt meter indicates I have 23.7v available. The transformer is 30amp. I did put the power kit on the proper terminals (backdoor and transformer) as per the on-line instructions for a single doorbell.
The front door has an identical device which works perfectly. It has been installed for many years.
I have run out of ideas to try fixing this issue. Any ideas would be helpful.