Sorry to say that Plex stopped supporting EPG for Australian customers after 1-July with v 1.16+ versions of PMS.
You either need to downgrade to v 1.15.... or use an alternative method to provide the EPG. There is a whole thread on it here.
Good luck. Beyond this, I cannot help as I am in the UK. For what its worth, countries that do still have a Plex EPG are also suffering because most of the information is missing or wrong (incl. USA customers).
