Please discuss with your Twilio Administrator, reference the following documentation:
https://www.twilio.com/docs/usage/your-request-to-twilio
"Both authentication methods use HTTP basic auth because it is well supported with web development tools. Most HTTP clients (including web-browsers) present a dialog or prompt for you to provide a username and password for HTTP basic auth. Most clients will also allow you to provide credentials in the URL itself. For example:
https://{AccountSid}:{AuthToken}@api.twilio.com/2010-04-01/Accounts/"
Remove "{AccountSid}:{AuthToken}@" that information is being entered elsewhere in the SMS configuration; the end URL should be:
https://api.twilio.com/2010-04-01/Accounts/"