Firstly, you need to ensure that activity is setup against one of the cycles. 

Once a reporting period has been setup, the administrator of reports needs  to go to; 

Academic Reports > Academic Reports Setup > Activities > Clicking Edit against the Activity group and selecting the activity cycles to import. 

Select Source: Activities 

Activities Sync Settings > select the cycle > Save

E.g. 2020 Annual, 2020 Term 1, 2020 Semester 1, 2020 term 2 etc 

You may select more then one cycle.