I have got the problem with some missing icons, too especially I don*t have an icon to switch beetween virtual desktops. Is there anything more packages to install? I installed sudo qubes-dom0-update latte-dock,too as a dock and sudo dnf install kdelibs . I try to install kscreen now, maybe that is enough for my icon problems, but as soon I know what the problem is, I will post an update. 
At me teams has got a T and some other things as the shortcut item. I am running the orig ms teams version not the electron.