Can you let me know if this ever works out? Also have an sn200. Also not sure if it's the same issue, but a friend also had a single sn200 that would break boot when put in his dell server. Other sn200s were fine. He ended up loading the sn200 on a different box and wiping all the nvme namespaces it shipped with and made a new one, then the dell didn't complainWorking through the maze of WD support.
It seems that HGST has a support portal (B2B, make sure to register with a @dot.com email) where you can register enterprise drives. I registered and my assets are pending verification.