Sending "Error Detected" has failed multiple times, including in a re-test now.
Tried changing to "Hey Jeremy1026: Error in payment processor at 3:42 PM", same status with no delivery to my phone number, ID: jz44a46jjpx7vjpzsa9c0soc.
I used to work with Twilio pretty heavily at a SaaS, I left as they started to crack down on SMS. One of my last projects was developing an in-app front-end to submit the regulatory paperwork to get higher delivery rates for SMS. I know it was a huge pain, sounds like it still is.