Pocket Informant 3 and up for iOS no longer officially supports WebIS Desktop Sync (WDS). What this means is that a brand new install does not allow WDS to be added a supported sync account. WDS is our direct sync to Outlook option, but it requires configuration and does not support the latest Outlook 2013 release.
You must be using Pocket Informant 3.3 or above. Then use this URL on device to unlock WDS: