Transparent Skybox (Overlay Game)

Hello! I am trying to get a transparent window similar to this post.

Using the code from that forum I got clickthrough and window resizing working. The problem is a material one (i think). I set up transparency and RGBA in the project settings and can make see through objects in my game but they don’t let me see through to the desktop.

If anyone has insight into this problem I would greatly appreciate it!