Fortnite banned forever?

I just opened Fortnite and it says that I no longer have the necessary permissions to play Fortnite. The only thing is that I didn't cheat or otherwise unfairly. Is it only temporary or is it forever?

Moin Tom,

It may be that the game data has been changed. This can either be intentional or unintentional. A new installation, including deleting the game folder, can help.

Best wishes