SCCM Current Branch Automatic Deployment Rule Will Not Run

SCCM Current Branch (1702).

Problem

Automatic Deployment Rule was running without error but not doing anything.  Downloading updates manually was working so not a problem with Internet connection etc.

Fix

The share/folder on the SCCM Site Server where the software updates were meant to download to (the Package Source folder) needed a tweak to the permissions.

Add the server SYSTEM account to the permissions for the folder and the share with the appropriate rights to be able to write to both.