Can't record DVR audio when doing screen captures

I'm trying to record a screen capture with audio using OBS. I've also tried Vimeo's screen recorder, and Movavi. They all record my microphone fine, and will even record YouTube audio, but not my system audio from Resolve.
In OBS I selected their Beta of application audio and selected Resolve, but it didn't record any audio.
In both Vimeo and Movavi I selected to record system audio.
Nothing works.
I was thinking about trying Filmora, but have a feeling it'll be the same situation.
Any suggestions for software that works, settings, etc.?
Thanks
In OBS I selected their Beta of application audio and selected Resolve, but it didn't record any audio.
In both Vimeo and Movavi I selected to record system audio.
Nothing works.
I was thinking about trying Filmora, but have a feeling it'll be the same situation.
Any suggestions for software that works, settings, etc.?
Thanks