Hi there @Colin_Mallon welcome to the community and thanks for posting. My name is Alexi Antonino and I am the Product Manager for Atlas SQL and the new customer Power BI Connector. I have not tried the connector with DataFlows or Datamart yet. I will try it out and see what I can figure out. I will see if I can get some time today or tomorrow to explore.
Based on the error you have reported, it would indicate that Dataflow does not work with our ODBC driver. But it might just be that it can’t be accessed or something to that nature. I will let you know what I find.
Best,
Alexi