Video doorbell not connecting

Hi, I have the original video doorbell. I changed my router recently and it reconnected on after the change. Today I noticed it is not working, so I'm trying to reconnect it to the wireless network which is a very strong signal. I press the orange button and the white light spins. About 5-6 seconds later, the white light just stops spinning and a further 10 seconds later the ring app just says it cannot connect. How do I fix this? Many thanks.