I have similar problems.
After a windows update, my HP Truevision webcam and mic disappeared completely. For 2 years they worked great, it was only earlier in 2020 the problem started occuring for me.
It now comes and goes. Somtimes it works, sometimes it doesn't.
It is really frustrating and for this reason, I will never buy another HP laptop again as there seems to be no fix for this problem. You just have to wait and hope for the best. One day it will work, one day it won't.
My youcan is now saying in a pop up that there is no webcam detected. This has only started happening in the last few days.
HP support are useless when it comes to this issue.
It needs to be sorted because in this day and age, a lot of us are relying on our webcam and mic for online meetings.