Thank you, FIDO2 was the magic search term. I'd been going through the "YubiKey Personalization Tool", which didn't say anything about FIDO, when I should have been looking at the "YubiKey Manager" tool instead.
If anyone from Yubico is reading this: Publish precisely one tool. One. Not one per function, for the same device! It especially doesn't help that they're all named similarly.
Stop shipping your org chart like it's a flatpack box of IKEA parts for your customers to put together.
It's still popular in certain corporate settings, where you're dealing with workflows that don't have easy support for FIDO2. For example, certain embedded browsers for logging in to VPNs.