The passkey on Android devices is usually stored in the Google Password Manager — provided it’s set up as the default option.
If you use a different password manager (e.g., Bitwarden) that supports passkeys, the passkey can be stored there instead — as long as you’ve set that manager as the default for “autofill” in your settings.
Example using a Samsung device:
Settings → General management → Passwords, passkeys and autofill → Select preferred service
Set preferred service
In this menu, you can choose which service to use (e.g., Google or Samsung Pass).
If you want to use the Google Password Manager, select Google as the preferred service.
Please contact the support team if you would like detailed instructions for your specific Android device.