When using LiberKey on another's computer, such as a public library, the LiberKey icon may not be visible in the notification area of the taskbar. When minimized, the menu can only be accessed by using hotkeys or clicking on the executable.
In this situation, the minimized menu must be toggled from it's application button in the Windows Taskbar. Please add controls to make this possible. Perhaps you can detect the visibility of the notification icon and display the button as needed.

Hello and welcome on forums.

You said "on some computers, the liberkey 's icon not be visible in the notification area of the taskbar".

Have you verify on these computers Windows'parameters, Its possible that it simply hide some of the icons (not only the liberkey's icon and KFA icon).

Sorry i've don't an english version of Window's, so it's possible the properties are a bit different :
In the the taskbar's properties you can find a button to personalise the taskbar.
When you click on it you have a windows that show you all the notification in the taskbar and you can check
"Always show all icons and notifications in the taskbar".

JP4U