Where can I find this livery in Rocket League?

I finished the task with the fortnite paint job (sticker) in Rocket League but got nothing. When I look at stickers there's nothing.

Can someone help me?

What kind of sticker?

You get the antenna, the topper, the body for the Octane and then the tires.

You mean the body, it's only available for Octane.

And always click on Claim in the challenge beforehand.

Oh that's right, I've now seen thank you.