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▲ linkregister 2 hours ago

The next paragraph states that Yubikeys are a registered authenticator. Yubikeys are platform-agnostic.

▲dingaling 2 hours ago | parent | next [-]

A closed-firmware USB key is really no better option.

Dear Yubico / Kensington / Google Titan, can I export my private key components to this other device, or even print them out on paper for storage?

No - you're just an untrustworthy user granted the fleeting privilege of using BigCorp devices. Now stop asking such questions or you might have your attestation revoked.

▲_bent an hour ago | parent | prev [-]

The issue is that operators can just curate a whitelist of authenticators they like. They could opt to not allow Yubikeys if they wanted.