I've never heard of that SSD brand before, but it could also be an issue with the adapter. I tried a few different adapters that didn't work for one reason or another before finding this one.

I'm using this adapter in my spare 6,1 and in several MacBooks with zero issues.

Sintech NGFF M.2 nVME SSD Adapter

• https://www.amazon.com/dp/B07FYY3H5F

Also I remember reading that early revisions of the 6,1 firmware had compatibility issues with aftermarket SSDs, which was later resolved in updated firmware revisions.

Recommended parts:

• SSD: SK Hynix Gold P31
  • Runs cooler than Samsung SSDs and more efficient
• Adaptor: Sintech NGFF M.2 nVME SSD Adapter Card - No Backplate Version
  • https://www.amazon.com/dp/B07FYY3H5F?psc=1&ref=ppx_yo2ov_dt_b_product_details

Not compatible SSD:

• Samsung 980 Pro
• WD SN770

Which adapter did you use? The Sintech with the "backrest" or without the "backrest"

https://www.amazon.com/dp/B01CWWAENG?psc=1&ref=ppx_yo2ov_dt_b_product_details

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https://www.amazon.com/dp/B07FYY3H5F?psc=1&ref=ppx_yo2ov_dt_b_product_details