[kps]

FIDO® Certified what? CTAP2? Apple doesn't seem to say.

[arianvanp]

Looking at the AppleID js source code they support both CTAP2 and U2F

[kps]

There are reports on Apple support pages¹ and elsewhere² that the ‘blue’ series Yubikey doesn't work.

¹ https://discussions.apple.com/thread/254582672

² https://www.reddit.com/r/yubikey/comments/10jll3q/security_k...

[greggsy]

Doesn’t support native smart card (PIV) mode.