alt Hacker NewsIt does not work for me on my Linux PC with Firefox, PayPal simply refuses to enrol passkeys and Amazon tries but then gives an error. I haven't tried chromium as I don't have it installed.
I'll give it another try though. The last time was 1 year ago. I don't normally use Bitwarden so I have to set it up from scratch with vaultwarden etc.
This is probably a Linux issue. Mac OS and Windows implement the FIDO2 Platform API, which allows them to act as authenticators themselves. Linux does not. See https://github.com/linux-credentials.