-Open the registry editor. -> Windows + R then type in 'regedit' and press enter.
-Navigate to this registry key: HKEY_CURRENT_USER\Software\Epic Games\Unreal Engine\Identifiers
-Delete the folder
-Restart the ENTIRE Epic Games Client, not just the game. -> This should regenerate the registry keys with new values, thus unbanning your account.
This worked for me as I was getting banned with every account I made.