Tried to pick up Hilton yesterday for tonight, but the claim won’t go through until tomorrow? I haven’t had him yet for this year...?

Question

Answer 1

Look at your league settings.   Most have a 2 day turnaround.   Also, it doesn't have anything to do with whether you've rostered him before or not. 

Answer 2

If he was on waivers and not a free agent, then this can happen. You need to pick up a free agent to get the player immediately.