How do I find my passkey

Most accounts, like those provided by Google, Microsoft, and Apple, now require two-factor authentication (2FA) in order to successfully log into them. Earlier, when you enabled 2FA on these accounts, you were provided the option to receive a verification code (a number of digits) via either an email or text message to be used as a second security factor after entering your user credentials (username & password).

Recently, a number of these accounts now employ the use of passkeys instead of you having to enter your user credentials and a verification code. The Apple Support article I have referenced below provides more details on what passkeys are all about.

Regardless of the account, they are NOT generated automatically. You would have to interact with their creation before they can be used. Once created they are stored on your device. By design, you don’t have to enroll a passkey manually on every device you use. As the FIDO Alliance describes it, “When a user creates a passkey on any of their devices, it gets synced to all the user’s other devices running the same OS platform which are also signed into the same user’s platform account.” This works, for example, on Google accounts for Android and ChromeOS; Microsoft accounts for Windows; Apple ID for iOS and MacOS; and so forth.

When a site offers you with the option to log in by other means, like your Google or Apple user accounts, they are providing you with alternate methods of logging in should you not have a passkey for that site.

Ref:

• About the security of passkeys - Apple Support