I have a similar problem as described in this old post from a year ago: incoming call are not indicated via ring-tone. The pop-up window appears, but I do miss this window regularly. So I really would appreciate an audible notification.
No matter what adjustments to standard apps or sound devices settings i make, not ring-tone. It used to work but stopped all of a sudden some month ago. I have no indication whatsoever what could have cause this behavior.
I'm currently on 1909.1833.110, no update on 2004 is currently available for my system, otherwise I'd have tried this, too. I also removed all other devices to avoid interdependence issues, did not help either.
Any other sound related functionality is working fine.
Hopefully someone here can help me out here!