Dressing room won't show my skins, I cannot access Marketplace

I started having the bug that the Dressing Room won't load and I cannot access my skins. I also cannot access Marketplace. When I play in a world and try to access Marketplace, it says "Invalid Session". I have restarted Minecraft several times, restarted my computer, and uninstalled and reinstalled Minecraft. None of it worked and I still have the same issue. Please help me at your earliest convenience.  

Thank you.