Same here - simply cannot fix it, and it's somewhat annoying that it talks about Yubikeys when I'm only using on-device security keys instead. Must be very confusing for many others!
I was very confused, too. I mean, I do have a YubiKey but Twitter/X has never (or for a very very very long time not) asked me to use my YubiKey to authenticate. As far as I could remember, I only need to use OTP from Authy as 2FA to login. So the whole thing smelled really fishy.
