Profile picture for support site can't be changed

I recently logged into support.halowaypoint.com for the first time, and my account details on it were automatically populated with information already associated with my microsoft account. The profile picture is the first one I ever used on xbox, when I was much younger (which I have since changed. Here it is, if you’re interested: Imgur: The magic of the Internet

I’m not a huge fan of having anything I post to the support site being tagged with this decidedly cringey image. According to the profile page on the support site, I can’t change it there. Is it possible to change it elsewhere?