Did you cheat to get a license? Try "Commune with the departed" this should be the only one available to you when you have no medium skill. Do not queue up anything else.
Move your Mods folder to the Desktop and delete localthumbcache.package. Then test the game in a new save. See if a sim can use the seance table. Consider getting the complete seance set instead of the individual items Not that it should make a difference I just find it easier to do that.
@Cainmy Did you move your saves folder back into the newly created The Sims 4 folder, or just the individual saves. Some mods put settings files in your saves folder, you need to make sure those are also removed when you remove your mods.
Also, as an aside, I've never needed crystal ball to use the séance table, I always thought it was just for show. I rarely use one (the sim below doesn't have a crystal ball on the séance table).
Best regards,
Jennifer
