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
Finishing an upgrade project after being a while since doing one, I wanted to take the time to share the experience and how easy has Cisco made it into upgrading their software.
It may look a bit disorganized, but you will find few things that I used to refresh my memory on the process, but I found that it was a surprisingly less painful than before. Now, one thing I like to mention is the fact that this is still a Refresh Upgrade because of the change on the REHL version of CUCM, but the Refresh Upgrade COP is not needed, note that the previous version is 9.x.