I am striking out on this one. I have ordered two different wireless charging cases for the 6s+ and neither of them work, bringing up the "This cable or accessory is not certified..." message and neither actually charge on my QI pad. Pad works fine with Android phones, so the pad is not the issue. I can find an MFI certified wireless charging case on Amazon for the 6S, but not the 6S+. Any ideas? Thanks.