It's not possible to run a Dataflow Gen2 as Service Principal.
This is documented here: Background Jobs - Run On Demand Execute - REST API (Dataflow) | Microsoft Learn
It would...
This is an absolute need for us too. Officially supporting the fabric-cicd project, recommending SP as a deployment entity and disabling Organizational User authentication for deploying makes it a must have feature that I expected to be implemented since OA deployment was deprecated/disabled.
