No audio on hard wired video doorbell

I’m having this same issue!! I’ve checked EVERY SETTING a billion times, I’ve restarted it I can’t tell you how many times hoping that would fix it too. I mean literally it was like BOOM overnight the audio just went out & I haven’t been able to hear anything since.
I’ve rebooted my cell too hoping it had something to do w that-nada!!

** App & Firmware are all up-to-date || iOS is up-to-date || settings are all correct **
Someone please help us!