Is there a fee to sign up for these Lightning Now Tours? I see some are saying to use a promo code and others do not. I don't see there is a fee for these and assume these workshops are free. Can someone confirm?

I am trying to complete my badge for the Create Reports and Dashboards for Sales and Marketing Managers, however in one of the challenges for the Group and Categorize Your Data section I keep getting an error message when I try to verify my steps. This report was not one of the reports to create in this section.
Challenge Not yet complete... here's what's wrong:
The 'Users Not Logged in Last 7 Days' report does not seem to grouped on 'Close Date' by Calendar Month.

Why would you group a user log in report by a close date for one, and two Users Not Logged in Last 7 Days is not a report built in this section.

SFDC- can you help fix this?? I can't get my badge because of this.

 

I'm doing the "Create Reports and Dashboards for Sales and Marketing Managers Group and Categorize Your Data" module of Biz Admin Superbadge and I am getting an error asking about a report not in this module, "The 'Users Not Logged in Last 7 Days' report does not seem to grouped on 'Close Date' by Calendar Month." I believe it should be looking for this report, "Opportunities by Rep and Close Month" of which I do have it grouped by month.