Not recognized in Kingston Mobilelite G3

I had this same problem. The issue is that the newer WD My passport have GPT partitions. The MobileLite only reads MBR partitions. Using DiskPart in command prompt you can change the type of partition by using Convert to MBR. If you are unfamiliar with DiskPart, make sure to find good instructions, you don’t want to screen up you main hard drive. Mine works fine now.