Me too. Was there some regulatory change that makes spraying SMS more difficult? It'd be great to hear from someone that works there or at Vonage which sees to have suffered the same fate.
https://clerk.chat/blog/tcpa-compliance/
We had to switch off Twilio for our integration and move to another provider that came with its own set of issues.
To call Twilio’s 10DLC handling “incompetent” would be a major understatement. In general Twilio was horrible to work with, we’d jump through all their hoops and they’d still block our messages randomly.