Onedrive code

So I was searching through my old shit and found that I had a onedrive code that was still valid and I didn't even knowthey did codes lol. I've searched all through the Microsoftwebsite for where I could redeem it but I was unsucsesful. I tried redeeming it at my account overview but it said some shit like you are redeeming it on the wrong page.

If anyone knows where I can redeem Onedrive codes, that'd be great.