no notifications from ring doorbell 2 and also no sound from chimes

since today I don’t get any notifications from my 2 doorbells (Ring doorbell 2) and also no sound anymore on the chimes that are linked to the doorbells. Both doorbells still record the live view and I have 2 other Ring products from which I get notifications. I have already reinstalled 1 doorbell and 1 chime but that doesn’t help. Any suggestions to solve this issue?