Do I use my Apple Watch even though I forgot my old apple ID and password?
What are the best thing to do if you forgot your apple ID and password in order to unpaired your Apple Watch
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Best reply
the activation lock is not really on
the watch it's a theft protection measure on apples servers
it needs to be removed
Lock on your Apple Watch - Apple Support
if you don't know your appleID Recover Your Apple ID - Apple
if that does not help you then you need the assistance of apple
Additional Support - Activation Lock (apple.com)
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