What's the best way to configure a StartFlowRun() task? I'm trying to kick off another flow from the "parent" flow. I'm on cloud, and running v0.15. When I try the following, I get a response that no flow is found:

StartFlowRun()(
            flow_name="subflow_name",
            project_name="my_project")

(I tried the query in the cloud api UI, and it does return a flow id) I assume the problem is that my flow is not authenticated to prefect cloud

We have lots of examples about that on Discourse here and you could also try this simple code example

They are both registered. Do I need to run

prefect auth login -k $PREFECT_API_TOKEN && prefect backend cloud

first?

yes, this is required to communicate with the Cloud backend