[URGENT] Calls Ending with “Customer Did Not Answer” — Twilio Error 31920

Starting today, all our calls are ending with the status “Customer Did Not Answer.
Upon checking the Twilio logs, we noticed the following recurring error: Error 31920.

Could you please help us investigate this issue?
Let us know if you need any additional details.

Example Call ID: 0199de77-e93d-744e-903d-a089ab48944f
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