[Samba] getent passwd blank response

[Robert E. Wooden]

I have an issue that "getent passwd SAMDOM\usrname" returns a blank 
response.

Running "getent passwd" returns all the local users.

I cannot determine if the libnss-winbind symbolic links exist.

This is a member server running Debian 10 with Samba v4.12.5 via Louis' 
repos.

The Sambawiki /Libnss winbind Links/ page shows Debian x86_64 source 
location as "/usr/local/samba/lib/libnss_winbind.so.2".

root at mbr04:~# find / -name libnss_winbind.so.2
/var/spool/postfix/lib/x86_64-linux-gnu/libnss_winbind.so.2
/usr/lib/x86_64-linux-gnu/libnss_winbind.so.2

Shouldn't the links for libnss-winbind have been part of Louis' setup?

How can I determine the presence of the links?

-- 
Bob Wooden