I forgot my password to activation lock

For general information on Activation Lock on the Watch, this is the same article that you previously viewed:

About Activation Lock on your Apple Watch - Apple Support

In any case you will need the password to the Apple ID that was used on the watch. You must use one of these steps to get the password to make the device usable:

If you forgot your Apple ID password - Apple Support

Without the original Apple ID Password, you will not be able to activate the Watch on your own. If you have the original receipt with the serial number to the Watch, you can request an unlock from Apple. They will not get involved unless you can provide the original receipt and they also do not get involved in third party sales where the device is locked.

How to remove Activation Lock - Apple Support

For this issue you have two options

1: Reset appleid password

2:submit an invoice (bill copy)to apple support to unlock your device

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