Apparently this is a common problem, which boggles my mind in 2013, but when I try to add funds to my wallet via a PSN card, the system recognizes that there is $20 on it, but sends me an 80710D23 error code when I actually try to add it. Any ideas on how I can resolve this amazingly backwards problem. Thank you in advance for any useful information.
This was my experience dealing with Sony support:
My advice is to make sure the receipt says "* ACTIVATED *". If it doesn't, take it back to the retailer and get a replacement card. It may be an old stock card that doesn't activate at the register. If it hasn't been activated by the retailer, Sony can't/won't help you at all - no matter what they tell you initially.