Thank you for rephrasing your question between the chatroom and here, it made me think of a solution. 
I am no expert, but you can try to edit /etc/ldap/ldap.conf to add an URI that your domain controller / samba can reach. It can be a public URI, but maybe it is preferable to use a private IP address (from the local network or a VPN, depending on your little ecosystem).
The line URI ldap://localhost:389 would become:
URI ldap://localhost:389 ldaps://10.0.0.1:636
Note that I suggest to use LDAPS for a secure connection, and I assume your YunoHost server has 10.0.0.1 as an IP reachable by your controller.
Do not forget to open port 636 within YunoHost and reload LDAP:
yunohost firewall allow TCP 636
systemctl restart slapd.service
