New user cannot access samba home share

Hi,
UCS 4.4-8 latest updates

When adding a new user in UCS and logging in to a Windows Client (UCS is PDC) the user cannot access its own home folder via Samba. Looking with an admin account it looks like samba is using a wrong SID (thus “unkown user” / “Unbekanntest Konto” in german) in permissions:

image

Couldn’t find any hint in the logs. Could someone give me an idea where to look?

Thanks
Daniel

Edit: I am talking about the standard “[homes]” folder of samba

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