Sound notification when someone joins my meeting - frustrating problem with settings

Hi, I'd be very grateful if someone could help me with a stubborn problem:

I would like to have a sound notification when someone joins my meetings (I do get a pop-up at the top of my screen when they enter the waiting room, but with no sound).

When I go into Settings / Meeting / Sound notification when someone joins or leaves, this option is already enabled, but I still don't hear the sound for any of my meetings, and when I'm working in other windows while waiting for my client to arrive, I can't see the visual notification. I used to be able to get a sound notification but some months ago that stopped happening for some reason completely beyond me.

Everywhere I look I just see the same advice, ie to check the setting I described above, but that is not where the problem lies. I've tried to "Reset" it, but it made no diffference.

Any advice would be gladly received!