So I just bought an XS and S4 Apple watch today. I traded in my old iPhone 7 and S2 watch. Both old devices were logged by iCloud, and then "Erase content and settings" was used. I restored my new XS from iCloud backup (which went well) but it fails to pair with my new watch? Say something like "Failed to pair" and then it automatically enters a dialing step. It seems to look after my old one, which I no longer have access to. Both old devices are removed from Find My iPhone, iCloud account, etc. How do I leave the new phone forgetting the old clock completely?