How to reset password
How to reset password on my I watch
Apple Watch Series 7
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Watch Password or Apple ID Password?
If Passcode you will have the follow the steps in this article
If you forgot your Apple Watch passcode - Apple Support
Apple ID Password?
If it is yours and you just want to remove the activation lock, remove the Watch from your account in Find My app on the phone or https://icloud.com/find
Forgot Apple ID Password?
If it is yours and you forgot it then see
If you forgot your Apple ID password - Apple Support
If it is someone else's password then only they can clear it.