I signed up using the promo code to in order to have a platinum account to gain access to the meal planner. It's the primary reason I signed up. But whenever I try to sign in, it says invalid Username and password. I have a platinum account, so it should work, but it doesn't. I have also tried downloading the Muscular Strength app to use it from there, but I still can't sign in. Do I need some sort of additional account for it? Anyone know how to fix this problem?