On your router, set the netflow source as the IP you are managing the device with.
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Try ths script:
ip flow-export source interface XXX where XXX is the interface you want it to come from.
188.8.131.52 is a loopback IP and has no reference to any interface, thus the CLI is invalid in my case. I would like to maintain this IP for reporting purposes and use NTA to poll Netflow at the same time.
EDIT: Sorry! I found the answer to this. Just set #ip flow-export source loopback1 and now it works! Thanks!