If you grok Apple, I wrote up a tutorial on very basic PassKey implementation (for iOS apps), here: https://littlegreenviper.com/series/passkeys/

Very nice, thanks! By the way, the preferred capitalization is "passkeys", like "passwords". It's not supposed to be capitalized like a proper noun.

I prefer all lowercase. Not sure where I got the CamelCase version, but it may have been from the Apple or FIDO docs.

I’d like to write a follow-up that covers authentication apps/devices, but I need to do some research, and find free versions.