Yeah that’s honestly wild if all legacy agents suddenly started failing without any code changes. That really sounds like something changed on Retell or Deepgram’s side maybe they removed/renamed the fallback voice mapping internally and older agents weren’t migrated automatically. I’ve seen similar provider-side breakages happen with voice configs before. If you want, send me how your fallback voices are configured and I can help you trace exactly where Retell is resolving deepgram-Luna from. Might save you from more hidden failures later.