I don’t remember Apple ID password to set up my watch
How can I pair my watch if I don’t remember email or password I set up watch
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You can request an Online Activation Lock Removal HERE.
Or this;
If you can't remember/gain access to the apple id that paired the watch to the phone.Take the watch and it's receipt along with some photo id and any other proof of ownership to an Apple Store and request that they remove the Activation Lock for you.