From reading other threads, what has happened to a lot of people was that they forcefully updated, which included the removal of a conflicting version of pulseaudio-qubes, when there was a conflict of package versions at some point. This occasionally happens with pulseaudio, when Qubes can’t keep up.
I’m not saying that this is what you did. There may be another issue that leads to this as well.
EDIT: Looking back at Sudo dnf update: requires pulseaudio, but none of the providers can be installed , did you perhaps do dnf update --best --allowerasing at some point? That could have been the problem.