How to Fix Salesforce SMS Delivery Failures Error 30034: A 2026 Guide to 10DLC Compliance

If you are seeing Salesforce text messaging Error 30034 or “Undelivered” status in your Salesforce logs, your organization is likely being caught in the February 2026 10DLC Zero-Tolerance Filter. Carriers (AT&T, Verizon, T-Mobile) have now fully implemented automated blocking for…








