[matthuisman]

@trevorbatley 
Try uninstalling all the add-ons (including merge).
Re-install them and try again

Thanks Matt.
Did a totally clean install of Kodi (18.2), after uninstall and removal of ~/Library/Application Support/Kodi directory.
Only installed PVR Simple IPTV Client, IPTV Merge and Foxtel Go.
Logged into Foxtel Go.
Ran Setup IPTV Simple client from IPTV Merge and then the Merge.
playlist.m3u8 and epg.xml files created. epg.xml looks good, playlist.m3u8 only contains '#EXTM3U'
Debug log attached https://paste.kodi.tv/betiluwiba.kodi
Trevor B (OSX 10.14.5)   

2019-06-15 10:09:47.019 T:123145505542144 DEBUG: plugin.program.iptv.merge - Merging 0 Playlists...

You haven't added Foxtel Go as a Playlist source.
You need to add it as a Playlist source and EPG source.

That is why your playlist is empty