Apple Watch series 6 activation lock

Hello,

I have purchased Apple Watch from an individual unfortunately I haven't verified the Watch at the time of purchase. Later when I checked it has an activation lock with the previous owner.As per Apple support, I have approached seller and requested to remove it from his iCloud and unpair it from the Watch app.

He did both and sent me the screenshots though still I am getting the activation lock page while setting it up.

Any idea why the Watch still asking for activation lock with the previous owner's account?

Please help, Thank you