30553: SMS is forced for two-factor authentication

This error applies to both Toll-Free Verification and A2P 10DLC registration.

Programs that use multi-factor confirmations or two-factor authentication (2FA) codes must offer at least one alternative delivery channel besides SMS, such as email, voice fallback, or push notification. SMS cannot be a forced requirement for security verification.

• A login or signup security page blocks the user from completing setup unless they provide an SMS-enabled phone number.
• The workflow states that text-based 2FA is mandatory with no other option.

• Update the authentication workflow to offer at least one alternative delivery method, such as an email confirmation link, alongside the SMS option.
• Resubmit once an alternative channel is available.

• A2P 10DLC Campaign Onboarding Guide
• Toll-Free Verification Onboarding Guide