The MIB's DESCRIPTION for cucsLicenseInstanceFsmRmtInvErrDescr is only the auto-generated stub 'Cisco UCS license:Instance:fsmRmtInvErrDescr managed object property', but the 'fsmRmtInvErrDescr' property name together with its SnmpAdminString type tell us this column, on a specific licensed-feature grant on a fabric interconnect (a feature name plus a quantity), holds the fsmRmtInvErrDescr as UCS Manager's data model defines it, exposed here as a read-only SNMP value (read-only). The fsmRmtInvErrDescr spells out in text what went wrong with that remote invocation for this license instance, complementing the bare numeric fsmRmtInvErrCode. It might read something like 'peer not reachable' if the cluster's other fabric interconnect was down during activation.