Problems creating passkeys - site specific

Any ideas why some websites (that support passkeys) are so problematic trying to set them up?

I keep an eye on passkeys.directory for accounts that I have so that I can enable passkey logins.

CVS is one and I have tried on several PCs to make it work, but I could never get past an error indicating that “Passwordless login cannot be created” or something along those lines. That’s on a Linux PC using Brave (yes I turned off Shields and my VPN, no difference).

Anyhow I had a brainstorm to try it on my phone and was able to quickly get it to work. Note, the Bitwarden app didn’t pop up and offer to save a passkey in my vault; instead the Google password manager did. I went ahead and set it up, because a passkey on the phone is better than none in spite of my preference to keep everything in my Bitwarden vault.

Are others having similar experiences?

Bitwarden doesn’t support passkeys on mobiles yet, and it when it does, only the newest Android most likely will have it. So even if you manage to get it set up on a pc now, on a mobile the passkeys saved in BW wouldn’t work. The other questions you have, I don’t know.