I am a new member myself (since 4 days ago). I don't remember the entire process, but I do remember that the ticket wasn't granted instantly. There was a hour delay or something like that, but it was definitely on the same day.
Make sure you are logged in at pokerstarsschool.com. Also, check your e-mail. I don't remember whether there was some sort of activation, but it's possible. Maybe the e-mail was filtered as a spam. Check your Spam/Thrash folders too. You must receive an e-mail titled "Your Poker Journey Has Begun!". That's what I have.
My ticket is inside "My stars" > Tournament Tickets > "The League - Initiation Level Access (Multi Tournament)".