@Members_TYKSzbf My guess is that since it's a 9 year old device, it is not compatible with the S25. You will likely have to update to a newer fitness tracker or smart watch.
Generally speaking if you open the wear app to transfer your watch/Fitbit to another phone, it automatically disconnects from the old device. There is only one device allowed per watch/Fitbit, although you can have multiple watches per phone. Transferring it through the Wear app will erase the previous device's ID info from it. If you had it paired to a previous Samsung device and had it logged into your Samsung account, you should be able to restore a backup rather than starting from scratch.
