How come I can't retrieve data in the 9-grid?

To plot the 9-grid you need to use at least 2 KPIs because you need a KPI for each axis in the 9-grid. So in addition to Skill, you also need either Performance or Potential. You can add these to the template for the discussion round.

More info on 9-grid? Read How does a 9-grid work?

How does a 9-grid work?

Completing and analysing a development conversation

How do I add a KPI to the development conversation?

Where can I find the results of the KPIs I measured in a development conversation?

Measuring KPIs in your performance conversations