I had previously thought (and it would now appear, incorrectly) that the Thunderbolt 2 port on my MacBook Pro (A1502) did not out put any voltage.

I assumed that this was why when you use an Apple TB2 to TB2 cable & the TB2 to TB3 adapter above, then connect the adapters TB 3 output into a NVME M.2 2280 External TB 3 SSD Enclosure it doesn't work. Others have said that the NVME enclosure wasn’t receiving any power and an enclosure with external power was needed. But this adapter seems to have about 50% of it’s circuitry dedicated to power issues…. So why don’t external NVME Enclosures work when using the TB 2/3 adapter?