CUCM Management affected CUCM 11.5(1) - Case Sensitivity

In case you are hit with this bug the solution is very simple, but asks the question, is it really necessary creating the UserID in AD with a combination of UPPER CASE and lower case? Here is the Scenario CUCM implementation of 11.5(1) with AD/LDAP authentication, once users are synced with LDAP you proceed to assign Power Users under End User Administration. All is fine but such users have their user ID as follows: AD UserID: WUser