Gridiron Squares supports only Passkeys for authentication. Some older browsers do not support Passkeys. Passkeys are digital credentials that replace passwords using public-key cryptography. When you create a passkey, your device generates a private key (stored securely on your device) and a public key (registered with the website or app). To sign in, your device proves it has the private key, typically using biometrics like Face ID, fingerprint, or a device PIN, without ever sending a password over the internet.