Doorbell power

Hi. After 2 years of using the doorbell it stopped working. Originally, was an offline issue. Usually when this happens, I just reset and resetup on the app. Now it won’t work.

I checked the voltage, reads 19v; says in the manual should be 16-24v.

After reinstalling wires (power cycle), the unit will have a yellow light. Lasts about 15 - 30 secs. Then nothing.

Will not flash yellow.

When pressing the reset button, not audible saying “ready to connect”

Spoke with support, they say the unit has “died”

Any other ideas?