No write access from Windows 10 onto SMB Share

[DosKobold]

Hey guys,
it's me again ...

I have a SMB Share in a jail on a ZFS Dataset.
Linux has write access. Windows 10 has not.

[global]
        dns proxy = No
        aio max threads = 2
        max log size = 5120
        load printers = No
        printing = bsd
        disable spoolss = Yes
        dos filemode = Yes
        kernel change notify = No
        server multi channel support = No
        nsupdate command = /usr/local/bin/samba-nsupdate -g
        unix charset = UTF-8
        log level = 1 auth_json_audit:3@/var/log/samba4/auth_audit.log
        obey pam restrictions = False
        rpc_daemon:mdssd = disabled
        rpc_server:mdssvc = disabled
        logging = file
        server min protocol = SMB2_02
        unix extensions = No
        restrict anonymous = 2
        server string = FreeBSD Server
        bind interfaces only = Yes
        netbios name = freebsd-nas
        netbios aliases =
        server role = standalone
        workgroup = WORKGROUP
        idmap config *: backend = tdb
        idmap config *: range = 90000001-100000000
        registry shares = yes
        include = registry
        vfs objects = zfsacl
        
[trans]
        comment = Shared Folder
        path = /mnt/data/trans
        valid users = user1,user2,user3
        write list = user1,user2,user3
        browsable = yes
        writable = yes
        create mask = 0777
        force create mode = 0777
        directory mask = 0777
        force directory mode = 0777

Samba server (v. 416) is running. All files are 777. ZFS is set on POSIX. Only the owner of a file has write access in Windows 10. Not group or other.
Is this a implementation issue with Samba? I am out of ideas.

Please share if you still have one. Thank you very much.