Blue Iris

I have two Dahua IPC-K35A
I have 3 of Dahua EW5531
I can get the audio to listen on BI to work but I can not talk through them. Is there a setting im missing?
Audio is on in BI and on the interface of each camera.

This might be a silly question, but do you have a microphone attached and enabled?

If so, does the mic work with any other camera, or can it successfully record a sound file to the PC?

All the cameras have mic and speaker enabled. The mic works fine. I can hear fine. It’s when I use the BI iOS app and try and talk to the camera that doesn’t work.