The message Discovery of LPAR <LPARName> did not complete: Unable to determine the following required values: is displayed when the IBM z/OS commands D M=CORE and/or D M=CPU do not generate output that includes the 'CPC Name', 'LP Name' or 'CSS ID' values, or when the value for 'CPC Name' is CPC_UNKNOWN_NAME. This indicates an unresolved issue on the mainframe, for example, as a result of a communication failure during an IPL. Consult the IBM documentation, ensure that running D M=CORE or D M=CPU on the mainframe results in the expected output then re-run Discovery.