Hi Ralf,
This isn't possible. S Series (now known as VSP One Object S Series node) are essentially a simple S3 bucket, configurable to connect with supported products such as HCP, HCP for Cloud Scale, VPS One Object.
AD / user management would run through the aforementioned platforms, where the VSP One Object S Series node support local authentication only. They don't possess the native capability to join a Windows Domain or authenticate against AD.
https://docs.hitachivantara.com/r/en-us/virtual-storage-platform-one-object-s-series/4.2.x/mk-hcps023/introduction-to-vsp-one-object-s-series-nodes/user-accounts