21910: Invalid 'From' and 'To' pair. 'From' and 'To' should be of the same channel

This error occurs when you send a Message resource request where From and To use different channel address formats. Twilio requires channel-specific addressing, such as an E.164 phone number for SMS or MMS and whatsapp:+15558675310 for WhatsApp.

• You sent from an SMS or MMS sender in E.164 format, but the destination is a WhatsApp address such as whatsapp:+15558675310.
• You sent from a WhatsApp-enabled sender, but the destination is a plain phone number instead of a WhatsApp address with the whatsapp: prefix.
• One of the channel addresses is formatted incorrectly for the channel you intend to use. For WhatsApp, both sender and recipient addresses must include the whatsapp: prefix.

• Make sure From and To are on the same channel before you send the request. For SMS or MMS, use phone numbers in E.164 format for both values.
• For WhatsApp, set From to your approved WhatsApp sender address and set To to the recipient's WhatsApp address. Prefix both values with whatsapp:.
• Verify that the From value belongs to your Twilio account and is valid for the channel you are using. Twilio only accepts a from sender that is hosted within Twilio and belongs to the account creating the message.
• If you send with MessagingServiceSid, omit From so Twilio can select a sender from the Messaging Service's Sender Pool. For channel destinations such as WhatsApp, add a sender for that same channel to the Messaging Service.

• Twilio Messaging Channels
• Messages resource
• Quickstart: Send and receive WhatsApp messages