Source note · Registering A2P 10DLC in Twilio
Using a personal, free or distribution-list email as the brand contact email causes Brand failure; Twilio error 21740 flags an invalid domain such as gmail.com.
Checked 2026-10-14
- Vendor
- Twilio
- Product
- Trust Hub
- Subsystem
- A2P 10DLC Authentication+
- Deployment
- multi-tenant
- Region
- us
- Release range
- current as of 2026-10-14
- Checked
- 2026-10-14
Sources
- Gather the Required Business Information for A2P 10DLC — Twilio · tier 2 current vendor documentation · section 'Business details', brand contact email
Cite this note
APA
WarmTransfer. (2026, October 14). Registering A2P 10DLC in Twilio: source note twilio-a2p-10dlc-registration-free-email-brand-failure. WarmTransfer. https://warmtransfer.net/knowledge/claims/twilio-a2p-10dlc-registration-free-email-brand-failure
BibTeX
@misc{warmtransfer-claim-twilio-a2p-10dlc-registration-free-email-brand-failure,
title = {Registering A2P 10DLC in Twilio: source note twilio-a2p-10dlc-registration-free-email-brand-failure},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/twilio-a2p-10dlc-registration-free-email-brand-failure},
note = {Source note twilio-a2p-10dlc-registration-free-email-brand-failure, checked 2026-10-14}
}