Adding A ring from previous Owner Doorbell

So I recently purchased a home and the old Owners left a Ring Doorbell for me. I have a complete Ring Security system at the new house with the ring Floodlight cam. I'm trying to add the doorbell to my ring App that the previous Owner had left on the house and it wont work because it is registered already. I have tried to Contact Ring about it and they said they would escalate it which was 2 weeks ago. The old Owners have moved to North Carolina and I have no way of Contacting them. I Can't imagine that my only option would be to purchase a whole new doorbell when there is one hardwired to my front door. Any solution would greatly be appreciated.