I lost the original phone I had my watched paired too. It’s been so long I forgot my iCloud a
Apple Watch won’t pair to new phone I forgot my old iCloud
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You can ask apple to remove the activation lock online on this page;
Remove the Activation Lock 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 with the serial number 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.