21659: 'From' is not a Twilio phone number or Short Code country mismatch

You can only send SMS messages from a phone number, Alphanumeric Sender ID or short code provided by or ported to Twilio.

For Short Codes, the From number must be in the same country as the To number.

• The number you are using is in the process of porting/hosting.
• You have provided an incorrect From number.
• The number may be formatted incorrectly. Twilio accepts numbers in E.164 format
• If the number is a Short Code, it must be associated with the same country as the destination address.

• If you have ported/hosted the From number, ensure that the process is complete. You can follow up on this in the Twilio console for porting and hosting.
• If you are sending from a Short Code, verify that the country you are sending to matches the country of the Short Code.
• Ensure the number you are using is in E.164 format.