Got this from the developer samplees on GitHub. Ran up the 'NetCore - Sample' project which simply suggested
'Build and Run the sample (if you are using the default app just build and run without changing the ApplicationId).'
So, I Built and Ran. I authenticated with a work account; and got this :
An error occurred while processing your request.
Request ID: |5310555e-43879defcc953231.
No report available in workspace with ID 54930729-56fa-4ee8-bafb-8a0fdf444dc3, Please fill a group id with existing report in appsettings.json file
While impressed that it knew where to go unfortunately there was nothing there for me.