If you get the PIN wrong on launching 1Password on Watch, the following message is displayed:
Please unlock 1Password on your phone to continue.
This is displayed even if 1Password is already unlocked on the iPhone. In any event, the iPhone app doesn't help you resolve this situation.
1Password Version: 6.4.1
Extension Version: Not Provided
OS Version: 9.3.1
Sync Type: Not Provided