They are still not implemented in major browsers and operating systems (e.g. Linux Chrome), so not likely much traction.
Not implemented.
https://issues.chromium.org/issues/417941069 more here.
For my excuse I should note, that this passkey support is relatively recent (end of 2024) and error message was really unhelpful to understand the issue. I was trying to use passkeys on my Linux computer like every few months since they started to appear on various websites and was frustrated by lack of support in Linux.
Thanks for pushing me into right direction, so at least I can now use them.