JessicaMuffles Are you saying that the game creates a new Sims 4 user folder in exactly the location of the junction? Or is the new folder somewhere else, perhaps in a different Documents folder?
If it is in the same location, the names have to look different to the OS, or else it wouldn't allow the two folders to coexist in the same place. So in that case, move the new folder to the desktop, copy its name, and paste that name onto the junction (overwriting the existing name).
If that doesn't help, please list the command you used to create the symlink.
