Apple added new security in El Capitan (10.11.0) called System Integrity Protection (SIP). Adding to SIP, further changes to the Keychain Access.app in El Capitan 10.11.1 has resulted in problems selecting “Allow” or “Always Allow” for some users when trying to activate Office. The problem did not exist in previous versions of OS X. More info on SIP
Note: A recent Apple’s security update for Yosemite and Mavericks included the security fix that resulted in . . .
Continue Reading: Click “Allow” or “Always Allow” to activate Office fails in El Capitan