Unable to start SystemTrayMenu with multiple users (e.g. terminalserver)

[BetaWayOfLife]

SystemTrayMenu only starts with the first user on the machine / server:

2024.06.21 07:27:17.082 1 ERROR Run as single instance failed
System.ComponentModel.Win32Exception (5): Zugriff verweigert
at System.Diagnostics.ProcessManager.OpenProcess(Int32 processId, Int32 access, Boolean throwIfExited)
at System.Diagnostics.Process.GetProcessHandle(Int32 access, Boolean throwIfExited)
at System.Diagnostics.Process.Kill()
at SystemTrayMenu.Utilities.SingleAppInstance.Initialize() in D:\a\1\s\Utilities\SingleAppInstance.cs:line 74