Finally got root!
My hints for it ( without repeating other people’s super useful hints)
Second user: I was trying to be smart by scripting my enumeration, but forgot to look for EVERYTHING when doing so (what you can see with naked eye and what you cannot).
Root: when loading the payload remotely, make sure you’re in the right place (it seems like pwsh needs to ‘see’ the content first, before it can load things from a remote location)
Hope this helps people still struggling with the machine, I enjoy it and learned a LOT from it. Thanks @egre55