Hardwiring not working

hi, I installed the Ring doorbell 2nd generation, today. I have hard wired it to existing doorbell wires. I have seen that if this is working as it should, then the ring around the actual place you press on the doorbell, should be lit in white. Mine is not. When I go into the app on my phone it says it is operated by battery. I will look again tomorrow in case one of the wires on the terminals has come loose, as it was hard to get it on there, but is there any other reason, anyone can think of?