Doorbell not working when someone presses button

For some reason our Video Doorbell 2 has all of a sudden stoped working when the button is pressed. Everything else seems to still be working (Motion notification & live view etc) - But when the button is pressed it works from outside (makes the tone and ring flashes) but i get no notifications on my phone, Linked Chime or Alexa (which i have all had previously set up and working) - Also doesn't show up in the history for a missed ring. I've ran the Troubleshooting and Tests from within the app and they all seem to say everything is working fine - But obviously it's not. I did think about completely resetting the doorbell back to factory settings and starting again but want to avoid that if possible as it has taken me ages in the past to get it set up and working how we wanted it with Zones etc.