Hello. I am getting acquainted with the Fedora operating system installed on Virtualbox. I noticed that there is no sound when you select the Intel HD Audio audio codec in the Virtualbox settings. In Ubuntu, which is also installed on Virtualbox, there is no such problem. When choosing the AC97 codec, there are problems such as sound jitter, intermittent sound when playing a video. Therefore, I decided to use Intel HD Audio, but as a result there is no sound.
I have installed the plugins according to the instructions you provide. I have made a reboot. There were no installation errors. Unfortunately, there’s no sound.
I suspect that the problem here is related to the problem of the Intel HD Audio controller (Virtualbox>Settings>Audio-Audio Controller>Intel HD Audio). I think that the specified audio controller does not work in Fedora (missing driver or other reason)