I am having the same issue with my floodlight cams, and I’ve seen other posts about it. unfortunately, I don’t think that there is an easy fix. For my floodlight cams, I can barely hear someone speaking to the device, but I can hear the footsteps and traffic noise in the background. That may be a hardware or a firmware issue.
If you can’t hear anything at all, that may be more of a hardware issue. You could try calling ring support, but it’s unlikely that they’ll be able to do anything sbout it. Or while you still can, you may want to return the floodlight cam and try another one. That may be your quickest route. Hopefully you’re doing the installs yourself, so that you don’t have to pay someone to do it…