Hello @Phil_Knowles,
As far as I am aware, TIDAL has a 10,000 Favorited album overall limit, and this would likely apply to playlists as well, please see this thread: (Add To Library not working [Tidal Favorites Limit Reached]). How exactly is your TIDAL not syncing properly? Can you please post a screenshot after following Greg’s instructions?
Thanks,
Noris