Error 21603

Product: Programmable SMS

ERROR - 21603

A 'From' or 'MessagingServiceSid' parameter is required to send a message

Make sure to specify a valid Twilio Phone Number, Alpha Sender ID, or Messaging Service SID in your API requests The 'From' parameter in your API request to send an outbound message did not include a valid Twilio Number, Alphanumeric Sender ID, or Messaging Service SID.

You can provide any of the above sender types in your From parameter. You may also provide a Messaging Service SID using the dedicated 'MessagingServiceSid' parameter, either instead of or in addition to a specific 'From' parameter.

Possible Causes

• You did not specify a 'From' parameter in your API request

Possible Solutions

• Specify a valid Twilio Number, Alphanumeric Sender ID, or Messaging Service SID as the 'From' parameter in your API request
• Specify a valid Messaging Service SID as the 'MessagingServiceSid' parameter in your API request