I have tried hitting the “#” DTMF key once the call center picks up. Right away a ladies voice says “Transfer”. I try hitting some DTMF digits and then it says “Invalid extension”. I have been able to do this on a few different fake IRS phone numbers. This can be done even if a live person answers the phone. Does anyone know what could be happening here? Here is a recording:
https://phone.firertc.com/calls/5b294f5d7475637abdaf0000/recording