We have a Gold Family Member account. My son, on his "sub-account" cannot invite a friend, nor can his friend invite him. I've allowed him in the Settings to invite friends, but each time we enter his friend's gamer tag we get the following error message: Can't complete this process. Please try again. For more info, visit www.xbox.com/support. Also, I can't figure out how to invite friends for him from the Xbox.com family center section either. I imagine/hope this is something easy. I'd appreciate any help.