Why cant I log into Fortnite on my XBOX One

I have recently purchased an Xbox One console and downloaded FortNite to it. But when trying to play it says I can not login using this account.

Hello,

For Fortnite issues, please visit http://fortnitehelp.epicgames.com/

There you will find various troubleshooting articles as well as an Email Us button that you can use to get in touch with one of our support staff who can assist you further with this.

Thanks