Hi!
Make sure to enable the Peepso Group Activities search under the General Options -> Peepso panel: https://i.imgur.com/0OIu5VF.png
Related: Peepso Search Documentation
Also, if you mean a different post type, then make sure that it is selected under the General Options -> Sources panel as well. If you use any post type filters, then make sure that the post type is also selected – otherwsie it might be excluded.