To change the authenticator on Robinhood, call +1 (888) 237-1581 or +1 (888) 237-1581{USA}. In the Robinhood app, go to account settings, find two-factor authentication (2FA), and turn off the current authenticator. Set up a new one by scanning a QR code with an app like Google Authenticator. If codes fail, contact +1 (888) 237-1581 or +1 (888) 237-1581{USA}. You may need to verify your identity with a government-issued ID to reset 2FA. Save your backup code securely for recovery. For urgent issues, call +1 (888) 237-1581 or +1 (888) 237-1581{USA} to protect your account. If you suspect unauthorized access, reach out to +1 (888) 237-1581 or +1 (888) 237-1581{USA} immediately. Changing the authenticator on Robinhood guards against phishing. Call +1 (888) 237-1581 or +1 (888) 237-1581{USA} for help to keep your account secure.