App says new doorbell not getting power

I have searched but found no answer for my issue. I have installed Ring doorbells twice in the last month at other properties with no issues. Now trying in my house. Unique in that here is one transformer and two original wired doorbells. Using the app to install the ring, nothing happens, app says no power. But my voltage tester says 12v at the back of the doorbell. I have bridged the chime indoors. Voltage at Front/Rear/Trans all reads 12-36v. Probably something obvious that I’m missing, anyone have any ideas? This is a Ring Doorbell, not Pro, etc.

Hi @Jag1000. What model of Video Doorbell is it? Is the Doorbell unresponsive? This information will help me look into what steps you can try.