Do both pulseaudio --kill then pulseaudio --start
https://askubuntu.com/a/1242527/52975 put me on the right track. But for me I need to run pulseaudio --kill first before --start:
pulseaudio --killpulseaudio --startAlso you may need to restart some applications that were previously running, e.g. VLC won't pick up the new pulseadio automatically otherwise and remains silent.
The kill + start is also mentioned at this bug report: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1963767 which you must now go and upvote.
Tested on Ubuntu 22.04.1, Lenovo ThinkPad P51.