Recovering Lost Audio

Hi all. We recently both live-streamed and recorded a video, but the person operating our ATEM mini pro ISO forgot to switch the mic to "ON", so none of the audio recorded. Is there any way to recover that lost audio through DaVinci Resolve or another other means?

No, you can’t recover ‘nothing’. There is no audio recorded so you never get it. Didn’t you record in camera?
And how can you forget to unmute a mic? In that way you don’t hear anything so it’s impossible to forget.

I'm assuming this is for one of the ISO channels, not the main program recording. If so, the answer is no.