Hi Greg,
I edited your post for privacy!
To find out what is going wrong, you will need to goto Twilio. Those messages say the SMS has been queued with them.
Login to twilio.com and click on “Monitor” on the left hand side.
Then Click on “Logs” and then “Errors” and then Messaging
Hopefully that will shed some light on what is wrong. You may need to search by the message ID from yoru post above.
You may need to click on “Error Logs”
Do let me know what they say!