Openfire meetings - issue with "invite others to conference"


I have seen several questions regarding issue with “invite others to conference”. I have the same issue… My openfire is connected to Active Directory and when I want create conference I see following error log :2015.09.29 10:57:47 org.jivesoftware.openfire.ldap.LdapGroupProvider - Could not find user in LDAP ofmeet1887.

Specific user was created in AD for conferences instead on standard “focus” and this user was defined in the group chat admins, also in meeting settings and in server parameters for meetings.

Please do you have experience how to solve this issue?

Thank you very much.

Kind Regards