I am having trouble accessing the Horizon 2 design storefront. Can someone from Forza help me!?!? :\

I am having trouble accessing the Horizon 2 design storefront. Whenever I try to access it an message pops up saying “the forza server is not available at time” this message repeatedly comes up and has done for months so I cannot access the design storefront. I was wondering whether anybody could help me and tell me what’s wrong with it and if so how to fix it or give some advise. Much appreciated if anyone could help.