always loved FNF, still makin FNF videos on my YT channel.. well.. i usually only play the roblox version bc when i try uploading a video with the ACTUAL game itself, no volume even though i had volume on while making it ;-
the problem is most likely your recording software, not the game itself. if you're using OBS, maybe make sure that the bar isn't at the lowest or that the audio icon isn't red with an X. I don't use streamlabs when recording, so I don't know how I would fix that. Probably the same thing though.