Doorbell Stopped Working

I had written a very detailed post and lost it all. I don’t feel like trying to remember everything I wrote so this will be the condensed version. Your help is very much appreciated nonetheless.

The home I just bought has a Nest system — 5 cameras, thermostat, and doorbell. All work (relatively) fine with the exception of the doorbell.

First button press: chime cuts off. Subsequent presses: may or may not work.

Note: the chime inside the house doesn’t ring when doorbell is pressed but it did when I viewed the house.

This is the device I saw attached to the chime: https://postimg.cc/Tpjx0cQF

This is my transformer: https://postimg.cc/gL8Wfypw

Nest settings: https://postimg.cc/CnZmxYLX

Anyone else experience something similar? If so, what did you do to fix it?

TYIA for your help.