I entered the code also and it just said something about me getting a cake but when I looked in my inventory there was no new reward to be found so maybe the glitch will be fix very soon and everyone like me will be glad to get our reward (LOL).
I didn't receive cake either . I even tried my uk friends house since uk don't have this problem but no luck . USA avatars must be buggy LOL. hope to see a fix . I want that heart motorcycle .