I had the drillthrough feature working on a table and upgraded to March release and now it no longer works. When I right click on the field, the only option is to see data, the drillthrough option no longer shows.
As I tested, the drill through features works in the latest Power BI desktop version 2.56.5023.1021 64-bit (March 2018).
In your scenario, please verify you have followed all steps in the article: https://docs.microsoft.com/en-us/power-bi/desktop-drillthrough.
Best Regards,Qiuyun Yu