Iwatch Cellular set up issues

I bought a new watch with gps+cellular. I was having difficulty setting it up. On phone for hours. At the store. No one could help me except to say I could send the watch back. I figured there had to be a solution. A youtube video suggested I make a new apple id just for the watch. During the set up you choose to make a new apple account. That ended up working. So if anyone had a cellular watch, at this point, it looks like you have to have a sepperate apple account for it. You can ad that id to your existing apple family plan and go from there as far as controls. Hope this helps. Not sure why xfinity does not know about this yet. At least not the folks I spoke to.