Junction file error for hard drive

@bbjerka  Three questions.  One, does your game currently open?

Two, where is the Sims 4 folder on your external drive, the folder that contains your saves, mods, etc.?  Please right-click this folder, select Properties > General, and post the Location.

Three, I need the full file path to the Documents folder as Windows sees it.  For this, open Command Prompt and enter this command:

reg query "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders" /v "Personal"

Then post the result.  This is so I can write out exactly the right command for you to use in creating the symlink.  You cut most of the command out of your screenshot, so I have no idea what you might have done wrong or whether the file paths are even correct for your computer.