It is only possible to drill down into a
User
Lookup column in data visualisation. Other Lookup columns do not support drill-down features.
No start date / No due date
Please note that it is not possible to drill down into the ' No start date' and 'No due date' values in task metadata charts based on date values. These represent 'blanks' in the data, and at present charts cannot drill down into blank values.
However, you can select 'No start date / No due date' as a filter, but it will not be shown in the chart itself. In this case, the chart cannot be drilled down, because all of the values are 'blanks'.
If the No start date / no due date is one of many filters, then the chart can be clicked to drill down, but only those values that are not blanks will be shown.
For example, if we have 10 records, 5 with No start date and 5 with a start date, then we click on the chart to drill down, only 5 records will be shown in the drill down.
Finally, please be aware that mixing No start date / No due date filters with other filters in this way is discouraged, as it means the drill-down values will not match the total in the chart, as the blank values are not included.