Mincraft Web site says I haven't bought the game yet.

I have purchased mine craft years ago, and can still play it. Although, when i try to change my in game skin. I get a prompt saying I haven't purchased the game when going to change my skin on the mine craft website.

Here is a screen grab of what I see: https://gyazo.com/b0d097c111bc5f01e4d80767efcb3475