Thank you for your response to most of our questions. It is possible the issue is related to the specific pinout of the cable and SFF-9402 standards. Could you answer some additional questions on your setup?
-What operating system are you using on the computer the unit is connected to?
-If possible, could you use a SFF-8643 to SFF-8639 cable to directly connect the drive to the motherboard or card? This is check if the drive is functional.
-Do you have any other drives you can test the MB021VP-B with?
-Is the m.2 slot in use in the motherboard?
I am asking engineering regarding connecting the MB021VP-B with devices that have a SFF-8643 connector and if there are any specific pinouts the cable should have. Once they get back with me, I will let you know. Please follow up on these questions and I can relay the information you provide to engineering,