216602: Content Type is not supported on this channel

This error occurs when you send a Content template whose available content types are not supported by the destination channel. Twilio supports different content types on SMS, MMS, RCS, WhatsApp, and Messenger, and each channel can send only the content types listed for that channel.

• The template only includes content types that the target channel does not support. For example, some types are limited to specific channels in the channel support matrix.
• You are sending the template through a sender for a different channel than the one the message is targeting. Twilio requires a sender that matches the destination channel, such as a phone number for SMS or MMS, a WhatsApp sender for WhatsApp, or a Messenger sender for Messenger.
• The template does not include a supported fallback content type for channels with fewer rich messaging features. Twilio can fall back to twilio/text in some cross-channel scenarios, but a template without any content type supported by the selected channel can still fail.

• Review the channel support table and confirm that your template includes at least one content type supported by the channel you are using.
• Add a simpler supported content type, such as twilio/text, when you need to send the same template across multiple channels.
• Verify that your From value uses the correct sender format for the channel you are targeting and that the sender is configured for that channel.
• If you created a template with a type that is available only through the API, create, manage, and send that template through the Content API.

• Content Types Overview
• Content API Quickstart
• Create templates with the Content Template Builder in Console