Comment by thebitstick

Time to pay up! Exporting is impossible on Apple's implementation of Passkeys. Even exporting your entire keychain of passwords doesn't result in any WebAuthn keys, just standard passwords. Tested on macOS 13 and iOS 16 betas. I sincerely doubt this will change with the official releases. Google's implementation is probably the same. Microsoft hasn't done a thing yet to support passkeys besides what Edge and Windows Hello do.