Apple Watch is pairing to an old apple id that is not valid

Can someone please help me. I have a new apple watch and I am trying to pair it to my phone, however it is automatically syncing to an old apple id that I have. I have tried to recover the password for this old id, however in the Data and Privacy website, it says that this id is no longer supported. How can my watch be syncing to an apple id that is not supported and how can I delete it if I can't get access to it??