I just checked my xbox.com page. I have the message, but it's only readable from my XBOX.
Which is kind of inconvenient because I would be able to copy & paste it into the Redeem Code field on the website, but now I have to open the message, write it down, and then enter it into the redeem code menu option on the XBOX.
"Gary was here. Ash is a loser!" = Greatest Tramp Stamp Ever