35127: 'Messages' Body and ContentVariables cannot be provided together

This error occurs when your request sends free-form message text in Body and template variable substitutions in ContentVariables at the same time. To send a content template, use ContentSid and optional ContentVariables. Do not include Body in the same request.

• Your request included both Body and ContentVariables.
• You intended to send a content template, but your request still included Body instead of using ContentSid for the message content.
• Your application mixes a standard Messaging API send with a content template send in the same request.

• If you are sending a standard text or MMS message, remove ContentVariables and send the request with Body and optional MediaUrl.
• If you are sending a content template, remove Body, include ContentSid, and add ContentVariables only when you need to substitute template placeholders.
• If your request includes ContentVariables, make sure it is part of a template-based send that uses ContentSid.

• Send templates created with the Content Template Builder
• Messages resource
• Content API Quickstart