21654: ContentSid Required

Provide ContentSid whenever your request includes ContentVariables. ContentSid identifies the Content Template to send, and ContentVariables supplies substitution values for that template's placeholders.

• Your request included ContentVariables but did not include ContentSid.
• Your application attempted to send a Content Template and only passed variable values.
• Your request builder or helper library did not include ContentSid in the final API request.
• You are trying to use ContentVariables with content that is not being sent as a Content Template.

• Add ContentSid to the send request whenever you include ContentVariables.
• Use the HX SID for the Content Template you want to send.
• If you are not sending a Content Template, remove ContentVariables and send your message with Body or MediaUrl instead.
• Verify that the template was created with the Content Template Builder or Content API. Only Content Templates can be sent with ContentSid and ContentVariables.
• If your current helper library does not support ContentSid, update it and confirm the parameter is being sent in the request.

• Send templates created with the Content Template Builder
• Content API public endpoints
• FAQs and troubleshooting for Content Templates