Apple Watch won’t pair because it won’t update

My husband hasn’t used his watch in a while and has since switched to a new phone. I have reset the watch, attempted to pair it multiple times, and the same issue comes up every time. When I pair it, it says the watch needs to update. When I agree to update, it says the watch needs to be connected to the internet. The phone is completely up to date on the iOS. I have reset the watch multiple times now to no avail. I have read the message boards and I see that other people have had similar issues but no resolution has worked that I have tried. Does any one have an actual fix for this issue? I even deleted his old app and reinstalled it.