@RicardoLonUK
I'm sorry that the steps didn't resolve the issue. If you're also having trouble unlocking the Mac itself then that suggests a deeper issue in macOS or watchOS that would need to be resolved first before we could look into the 1Password-specific issue. I recommend that you reach out to Apple Support for more assistance: Official Apple Support
Once you're able to unlock the Mac itself using your Apple Watch please let me know if you're still unable to unlock 1Password and I would be happy to help further. 🙂
-Dave