1Password8/Windows and Windows Hello on first signin?

I would suggest that anyone else who has this issue, waits for official documentation from 1Password, before proceeding with troubleshooting.

Correct, there is no need to do the command line as the same can be accomplished by turning off the biometric or PIN feature in the Windows Setting's Accounts > Sign-in options and re-enrolling the biometric or PIN; it'll go into the TPM's hardware store. This is assuming Windows has confirmed there is TPM enabled (click Start, search for Security Processor).

We will be adding some docs on this once this is working for folks in the way we expect it to work.