Currently, NFA does not Support flows from Aruba devices.
Aruba devices send the following IPFIX fields when looking at a pcap of the flow data:
However, they do not have inputint(input_snmp) or outputint(output_snmp) which currently are required to map data to input interfaces and output interfaces which is why NFA will drop the flows.
You can see if the flow data has the required fields by following this document, How to verify Netflow Fields using Wireshark.
This is similar to Cisco WLC devices which also are missing those fields and we currently do not support yet.
Feature Request F81929 has been submitted for Aruba support in a later release of NFA.call_made