I had the same problem, but I figured it out. If the report is placed in a group, you can't select that individual report in the group and set up scheduled reporting. However, you can set up automated reports for the entire group. So I have decided to not use the group reports feature if I am sending the reports to different individuals.

Note to Quickbooks Team: I think this is a silly feature. I want to organize my reports in groups, but not be restricted to send the entire list of reports to all recipients. Please fix this.