Argon NEO 5 M.2 - yet another SSD not detected

The fragility of the nvme cable makes it highly likely to be a common point of failure, but I feel like I have tried every possible which way (both cables in the pack, followed the instructions to the letter) and still no success.

That fact that it’s just ‘dead’ - I can’t see anything about nvme running ‘dmesg’ still makes the cable a prime candidate for problems.

I’m attaching a close-up picture of my latest (non-working) setup. If the cable is upside down or anything obvious I’ll wear it if it means this can be fixed…