Update-SessionEnvironment does not remove variables that were removed from user/system environment

[NorthLake]

Steps to reproduce

1. Set user or system environment variable TEST to test
2. Open a Powershell terminal
3. Remove the TEST variable from the user/system environment
4. Run Update-SessionEnvironment in the Powershell window
5. Run echo $env:TEST

Expected result

No output, env var was removed

Actual result

Test variable still exists in the PowerShell context

[asheroto]

Thanks for reporting the issue. I've made several changes to the script. Can you please try this version and let me know the results? The tests I've run look good.

https://github.com/asheroto/Refresh-EnvironmentVariables/blob/c1d223ab770c46b2782bbbfec462670f62cc242e/Refresh-EnvironmentVariables.ps1