This was a really frustrating fix for me. I must have reset my watch 3 times and then contacted Apple support only to be on the line with them for an hour and a half. They had me wait and wait and WAIT and WAIT to get back to me. Finally gave me a code and it worked but then I couldn’t get my Apple Pay to sync with my watch. Reset watch AGAIN, removed bank card from phone, added again and then my phone wouldn’t recognize the card. After a few more tries it accepted it and then I was able to add it again to my watch. So, my suggestion, if your watch doesn’t recognize your 3 months, don’t reset your watch, contact Apple but be prepared to wait a while for them to pay attention to you and help you fix it.