New video doorbell not working

I was bought a video doorbell 2nd generation for Christmas yesterday. I have tried to set it up and all the settings in the app says it is set up and working but it doesn't ring when the bell is pressed and it doesn't send any notifications. The live video doesn't work either. The only thing i haven't done is actually fix it the wall as I wanted to test it first. I have put the back on and put the screws in as though it is up though. I've deleted the app and reinstalled, I've reset and set up the bell twice but nothing makes a difference.