While using Network Flow Analysis to monitor Cisco SD-WAN data you may see a fraction of the data you would expect.
It was found that the SD-WAN code (17.3) we are using does not support and export the sampling information even if configured.
Component : NQRPTA - REPORTERANALYZER
Cisco TAC has submitted this as a bug (CSCvz22181).
Please upgrade the SD-WAN code to 17.6 or higher where the issue is not present.