Vincent Batoufflet writes:
# AutoFS access acces to dn.subtree="ou=mount,o=organization,dc=domain,dc=com"
^^^^^ Missing 's'.
Also, test slapd with loglevel 0x3C0 (see "loglevel" in man slapd.conf), or 'slapd -d 0x3C0 ...' so you can see what happens.