Windows 10: DISM /Online /Get-ReservedStorageState option unknown

I am following a tutorial here Enable or Disable Reserved Storage in Windows 10 in the option one section they mention
Code:

However this option when I execute it says

Code:

Here is a screenshot.



:)

 

Dism error 87 "cleanup-image option is unknown"

Im in winPE trying to use:

on an offline image but cannot get past this error:

I did the exact same procedure on windows 8 and a separate fresh install of windows 10 with no issues at all.

I've gone through all the Microsoft articles about dism i could find, many sites, and forum posts outlining the same handful of procedures that are supposed to fix this and other issues but don't seem to work half the time.

Supposedly error 87 is a syntax issue but this clearly doesn't apply to my situation. The error occurs with other options as well, /scanhealth, /checkhealth, /restorehealth, it isn't limited to just /cleanup-image.There appears to be no proven solution to this problem, if so its very hidden.

Any suggestions?

 

Programs not working

In post 26 there were steps listed to fix the operating system corruption.
Are you able to follow them?
In post 29 was the suggested dism repair command.

 

How to get damn DISM to work?

Thx guys, I'll compress this data into a blog post. For all the so called guides I've read, not a single one mentioned it has to be WIM file (some listed even ESD which clearly doesn't work) or that certain ISO images don't work with DISM.

After I've done DISM thingie, SFC also managed to repair stuff. Which is what I've needed here.