Why did I not receive the Exalted Frost Ice King Outfit Style in Fortnite?

All eligible Battle Pass owners or Fortnite Crew subscribers that had an active subscription at the end of the season received the Exalted Frost Ice King Outfit Style. 

You can find more information about the eligibility criteria in this news page (يفتح في علامة تبويب جديدة) or this community post (يفتح في علامة تبويب جديدة).