Product: Programmable SMS
Toll-Free Verification Required. You sent a message (message SID: SMXXXXX) from a Toll-Free number to a mobile subscriber in USA or Canada.. Twilio requires all Toll-Free numbers to go through a verification process. The Toll-Free number you sent from has not been verified through the required verification process.
Your toll-free number has not been Verified to allow sending of traffic in USA and Canada. Your toll-free verification request was rejected.
Please refer to https://support.twilio.com/hc/en-us/articles/5377174717595-Toll-Free-Message-Verification-for-US-Canada for the process to get your Toll Free number verified.
Starting May 16, 2022, any newly-purchased Toll-Free number on Twilio will need to be verified or it may experience service interruptions. Customers with existing Toll-Free numbers already on their accounts have until September 30, 2022 to verify those numbers.
Toll-Free best practices can be found at https://support.twilio.com/hc/en-us/articles/360038172934-Information-and-best-practices-for-using-Toll-Free-SMS-and-MMS-in-the-US-and-Canada