Aah, it looks like that adapter is for standard 2.5" laptop drives, instead of these SSD 'sticks'... And I'm not entirely convinced that SSD is quite a standard interface! Normally these M.2 form factor devices either have a SATA interface, with 2 cutout keys on the device for locating, or an NVMe interface with 1 cutout key offset heavily to one side.
From the photo, it looks like this has 1 cutout in the middle!!
Have a read of this and see if it helps? Also, post a high res photo of the interface and I'll try and assist further.
https://beetstech.com/blog/apple-pro...s-and-upgrades
Cheers