Your not alone there happened to me aswell. I brought the pack mainly for the crowns (though the xp and gold boost are a nice little bonus) but sadly no crows so i cant buy the mount i want
Got ESO Plus around 5pm EST, logged on and off several times but still no crowns.
As far as I know it takes at least 24 hours for your crowns to show up in your account. If you do not have them after 24 hours I would put in a support ticket.
Elder Scrolls is my second home.
Xbox One/Steam: oXb3 twitter