ok figured it out if your having trouble adding funds via the home store or the redeem code feature in your xmb using a PSN card it wont work right now but if you go into account manager then to transaction management and add to wallet there it works great.
im having that exact same problem. it keeps saying funds cant be added to my wallet, even if i do it from ps store, redeem code in account management or the way u fixed your problem. keep trying and nothing. even suport cant give me a right answer
I have a similiar issue. I used two different PSN redemption cards. Each bought from different stores and I redeemed one of them fine but the other one keeps telling me that the server is under maintenence. Makes no sense because i did it RIGHT after the sucessful redemption. Unless its coincedence, I really need that 20$ deposit. COME ON SONY FIX MY CARD!