Twilio Error Code 30034
If you look at the detail on an "undelivered" text and see Error Code 30034 (or 30,034), Twilio is saying you haven't completed your A2P 10DLC registration:
https://www.twilio.com/docs/api/errors/30034
You'll need to contact Twilio about registering or problems with registration. Unless you change the Twilio number you want LegalServer to use to send texts, no changes to the LegalServer settings are needed.