Ok, I finally got a couple of Collections from LrC synced to Lr Mobile, however from the sync prompts it appears things are in a queue 10 images at a time, with approximately 10,000 to sync it is going to take quite a while.
Since all users of LrC 13.3, Lr Mobile 9.3, Lr Desktop 7.3 have to update their synced images it will be quite a while for this to be sorted out.
... View more