Burndown chart shows no data in TFS

Question

I have on my project many PBIs and each PBI has tasks with remaining work filled in. I have finished some of my tasks, others are not started and others are in progress.

However, the burndown chart is not showing anything. Not sure exactly what I am missing to configure!

My iterations are like this:

Answer 1

This has to do with the fact that the burn down needs at least 2 days of data to show something. So basically it won't show any data the first day of the sprint but everything works 'surprisingly' on the second day. This is a longer existing issue as can seen for example on https://connect.microsoft.com/VisualStudio/feedback/details/788378/tfs-ervice-burndown-chart-first-day-work-did-not-get-reflected-in-burndown-chart.

In my current team we will just make the first day of our sprint (when we do the sprint planning) a team day off. This will make sure that the next day the chart is showing. Closing items directly on the day of planning will lower the starting point of the burn down chart. For scrum this is not a real issue because the chart must reflect the work that needs to be done and not the work that has already been done, but for our intern processes this has been causing a lot of confusion in the past.