JSON query against NCM returns no results

This query against the NPM data works.

https://10.10.10.10:17778/SolarWinds/InformationService/v3/Json/Query?query=SELECT%20NodeID%20FROM%20Orion.Nodes

Neither of these queries return any results.

https://10.10.10.10:17778/SolarWinds/InformationService/v2/Json/Query%3Fquery%3DSELECT+NodeID+FROM+NCM.Nodes

https://10.10.10.10:17778/SolarWinds/InformationService/v2/Json/Query?query=SELECT%20NodeID%20FROM%20NCM.Nodes

I suspected that I might have had a permissions issue, but I tried it with the Orion admin account and got the same results. I don't get a "you're doing it wrong" type message or anything.

I'm sure there's something glaringly obvious that I'm missing so if someone would point that out, I'd appreciate it.