Using EXIT command opens "OK" status window

Hi there,

New to VH, so still finding my way with stuff - apologies if this is very obvious, but couldn't find anything from searching.

I'm on windows10. I'm using VH alongside the Sunshine game streaming host. I've set a command in Sunshine that opens the client when it opens Steam (C:\\Vhere\\vhui64.exe). When closing Steam it I've set it to execute this:

 C:\\Vhere\\vhui64.exe -a -t "EXIT"

This works...sorta. VH seems to exit - USB access is returned to the host - but the client doesn't fully shut down, and opens a gui window that just says "ok" in it. This has to be clicked closed to make VH actually shut, and vanish from task manager.

This would be fine, except Sunshine thinks it's still open, and refuses to shut down the stream, making it unable to be connected to again without restarting it.

Any ideas what I might be doing wrong here? Is there another way to close VH and have it completely shut down without opening that gui window? I've tried TASKKILL which works, but for whatever reason stops the VH client from launching again until after windows restarts.