Forecast function disappear after publishing the report to workspace

Dear all,

I have been working on a report and added functionality of forcasting. The functionality was working pretty well within the desktop version, however, once after I pulish to workspace, the forecasts disappear. Even when I tried to add it back within the workspace, it doesn't work (I could see the forecast option, click add, there is then no reaction). 

Anyone else facing the same issue? Would it be possible to caused by license (I have pro-license but not premium license)?

Thank you!

Alfie