If you are using iCloud Keychain on your iOS device, you should first activate the password account in your settings.
  1. Go to Settings -> Passwords -> Password Options -> Toggle on “AutoFill Passwords and Passkeys” -> Choose iCloud Keychain.
  2. Open the Clave app.
  3. Click on “Create new account.”
  4. You will see the “Create passkey” pop-up.
  5. Click continue, and you created your Clave account!
iCloud Keychain Clave