How to assign permissions for Domain User * This didn’t work straight away so had to create local user and auth that way

vserver cifs users-and-groups local-group add-members -vserver %Vserver% -group-name BUILTIN\Administrators -member-names domain\username

Verify permissions 

vserver cifs users-and-groups local-group show-members

cifs share access-control show

vserver security file-directory show -vserver %Vserver% -path /CIFS/Folder

How to assign permissions for Local User 

vserver cifs users-and-groups local-user create -vserver syg-svm03 -user-name CIFSSERVER\adminlocal -full-name “adminlocal”