Thanks for posting. I was scratching to my head as to why ssh with FIDO keys wasn't working with macOS Monterey 12.2 which ships with OpenSSH_8.6p1 (as you say, FIDO support has been present since openssh 8.2). Is Apple rolling their own implementation of OpenSSH?
Back to installing OpenSSH with homebrew....
foo_____
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Did disable system integrity protection (SIP) prior to installing the extension/driver?