When pairing a new Watch it's asking for my Apple ID with an email that hasn't been used in years
I just got a new Apple Watch-my fourth. When pairing, it's asking for my Apple ID and password with an email I haven't used in over 15 years. If I use my current password it rejects it. This is also probably my fifth or sixth iPhone since I started using an Apple Watch, and I've never had this issue before.
I checked the Cloud site, and my current email is the only one showing.
Please don't tell me to go to an Apple store. The closest one is 600 miles away.
Apple Watch SE