If they are not listed there, then in each of those apps just reenable them in settings. If the app shows its enabled already then disable it and reenable after app restart... As a Steam user, I ...

Keeping all system tray icons visible helps me stay aware of what’s running in the background. Visible icons aren’t cluttered if screen space allows and background apps are limited. System tray icons ...

bugs the hell out of me, especially when they don't even include a "don't install this to the system tray" option during setup. since removing them is uaully pretty trivial, i don't bitch too much, ...