Thing is, I tried the Intel SSD on a friends board in one of the m.2 slots and it had no problem recognizing.
Unfortunately, my case is super small - not designed for any 2.5 drives. With the second m.2 slot, my intention was to never need a 2.5 incher.
I might be able to rig something up for a 2.5, we'll see if I can figure the m.2. Pretty frustrating.