If OnCommand Unified Manager 6.2 is paired with WFA3.0, while upgrading either the Unified Manager from 6.2 to 6.3 or WFA 3.0 to 3.1, it is required to break the existing pair, and re-create it after upgrading one or both the softwares. Unified Manager 6.3 will work only with WFA3.1 and it will not work with 3.0, so WFA upgrade is mandatory if Unified Manager is upgraded from 6.2 to 6.3. Unified Manager 6.3 GA should be paired with WFA 3.1 GA.