Pair watch with phone
I forgot my password on my watch and I need to re-sync it with my phone
Apple Watch Series 8, watchOS 9
Question marked as
If you forgot your watch passcode, see:
If you forgot your Apple Watch passcode - Apple Support
If you forgot your Apple ID password, see:
If you forgot your Apple ID password - Apple Support
If you are the ORIGINAL owner, then see the 'Start a support request' section in:
How to remove Activation Lock - Apple Support