Unable to generate Security key

Same here. Loading issue. Any idea?

Trying different os, browsers etc. WordPress on docker up-to-day, https present (Let’s encrypt)… what am I missing?

Anyone anybody ? Is this project alive?

I ran into the same issue. It appears to be a known issue, with a solution slated for the 0.8 version to be released. Until then, a workaround can be found here https://github.com/WordPress/two-factor/issues/488. Installing the additional “WebAuthn Provider for Two Factor” will enable you to add new/additional keys.