Video doorbell pro doesn't ring my iphone

My video doorbell pro stopped calling my iPhone when the doorbell button is pushed. The firmware is up to date, notifications are on, events mostly recorded (some still start late), and who the heck designed this disgusting posting page where I can’t scroll up thru my text as i write it in iOS duck duck go.
Do I have to do full reset? How? Will I lose my settings? TIA

I have a feeling this will get into advanced things.

You could try power cycling everything (doorbell, router/AP, reboot phone) as a simple beginning thing that might work. If you didn’t already.

I would only “throw out” (clarification: type/say) complicated things after that.