Use this only if you previously created a Manuals+ passkey. If this is your first sign-in, choose Create a New Passkey; no existing passkey or other Manuals+ login is required.
Older two-factor/U2F-only security keys are not compatible. To create a passkey, use your phone or a FIDO2/passkey-capable security key.
If your browser allows it, Google One Tap may appear automatically above the button through Ezoic. X and supported passkeys stay under Other Options.