Twilio Docs

SMS
Voice
Runtime
Video
Studio
All docs...

SDKs
Help
Log in
Sign up

SMS
Voice
Runtime
Video
Studio
All docs...
SDKs
Help
Log in
Sign up

Menu

Error Reference

Collapse Expand

Rate this page:

Error 63021

Product: Programmable SMS

Channel invalid content error

Possible Causes

Message has invalid content. Please verify the content and re send the message

Rate this page:

Terms of Service
Privacy Policy
Copyright © 2022 Twilio Inc.

Thank you for your feedback!

We are always striving to improve our documentation quality, and your feedback is valuable to us. Please select the reason(s) for your feedback or provide additional information about how we can improve:

If applicable fill in the countries where you are using Twilio

The page is missing information or code

The page content is confusing or hard to follow

The page has inaccurate or outdated information

The page has a broken link or a typo

This information did not solve my problem

The page content was easy to follow

The information solved my problem

Other

Need help? Talk to Support

Protected by reCAPTCHA – Privacy - Terms

Sending your feedback...

🎉 Thank you for your feedback!

Something went wrong. Please try again.

Thanks for your feedback!

Refer us and get $10 in 3 simple steps!

Step 1

Get link

Get a free personal referral link here

Step 2

Give $10

Your user signs up and upgrade using link

Step 3

Get $10

1,250 free SMSes
OR 1,000 free voice mins
OR 12,000 chats
OR more

Learn more about the referral program