I am getting the same error. There is not a tab in the Fortnite settings to change to another payment account. Ive tried reinstalling software still doesnt work. Im located in the US so that isnt the problem.
Guys I have same problem, and after I clicked on ikonic at shop, always this annoying code shows e100008/6050/com.epicgames.fortnite, what should I do? Plz help me I am so mad. I wrote to epic games support but they didn't answer me .