Can't move Teams across Virtual Desktops
A KDE/Plasma application should have a little app icon on the top left corner, which you can right-click to open the "Move To Desktop" menu. From there, you can move the app to one of your Virtual Desktops (or show it on all of them). Microsoft Teams has no such icon, and therefore doesn't let the user move it to a different Virtual Desktop. Please fix this.
Paul de Vrieze commented
You can also use the right click menu on the taskbar
You can use Alt-F3 to open the KDE window menu, that has an option to move the window to a different virtual desktop.
There is also an option to enable window decorations. This looks much nicer, but it is impossible to resize Teams when you do this.
Therefore, please support native window decorations, which would also fix this issue.