Hi.
To pinpoint the exact issue, just try the debugger I guess?
So enable debugger on the particular action, and start stepping through. At some point your flow will stop, and you see the error in the console. From there you are able to go further.
Nanoflows run in the browser, not in the background on the server.
It’s also possible to execute a microflow from a nanoflow, so that way you might get to a rule which is only triggered from a microflow.