Add Environment Variable to MSIX package using PSF Fixups in Packaging Tool - what am I missing?

Hanessa​ 

1. If you are adding the PSF using the MMPT, that version of the PSF does not support the EnvVar Fixup.
2. If you added the PSF using PsfTooling (or TMEditX or any of the other third party tool that pulls from the TimMangan fork of the PSF), then the EnvVarFixup is available.  However, note that the environment variable will only available to the running applications inside the container - you will not see the variable on the end-user system by looking at environment variables from outside the container.