Apache httpd LDAP authentication fails when authorized group is the primary group on Active Directory

Issue

• I'm trying to configure Apache httpd so only users belonging to a particular group in Active Directoy can access a certain resource. For this I configure:

  require ldap-group cn=mygroup,ou=mycompany,dc=com
  

  However, authorization always fail.

  [Wed Jan 30 09:14:47.507310 2019] [authnz_ldap:debug] [pid 7245] mod_authnz_ldap.c(989): [client 10.0.0.1:50160] AH01718: auth_ldap authorise: require group (sub-group) "CN=mybasegroup,OU=myorg,DC=org": didn't match with attr DN failed group verification. [member][5 - Compare False]
  [Wed Jan 30 09:14:47.507318 2019] [authnz_ldap:debug] [pid 7245] mod_authnz_ldap.c(996): [client 10.0.0.1:50160] AH01720: auth_ldap authorize group: authorization denied for user myuser to /index.php
  

  I'm certain that the user belongs to that group because it is configured in Active Directory as the user's Primary Group.