Apple Watch Activation Lock.
Can the previous owner be contacted by way of the serial number associated with their cloud account to assist in deactivating?
Can the previous owner be contacted by way of the serial number associated with their cloud account to assist in deactivating?
I'm afraid there is no way of contacting the previous owner, and only they can unlock it. Unfortunately, given your inability to contact them you will not be able to use the watch.
Apple Watch Activation Lock.