When trying to add a FIDO2/U2F security-key-backed Ed25519 key to my community profile SSH keys, I get this error:
"Only keys of types ecdsa-sha2-nistp256, ecdsa-sha2-nistp384, ecdsa-sha2-nistp521, ssh-ed25519, ssh-rsa are supported, not sk-ssh-ed25519@openssh.com."
Any reason we don't support the sk variants?
No reason, I think it's just an oversight. I'll stick it on my list to try to get fixed quickly, unless beaten to it.