If you downloaded your 1099-k as a pdf, you should have a 2nd page that explains how they calculate the ‘unadjusted gross income’. After you generate the Date Range Report, you can use that 2nd page to help you reconcile the 1099-k. The unadjusted gross income should match what’s on the 1099-k.
Note that, if you had any invoiced orders during the year, you’ll need to run a separate date range report for those, follow the same procedures and then add the totals together. I spent a ridiculous amount of time trying to track down an amt from 1 lousy order early last year. Turns out it was an invoiced order, so not included in the regular date range report. Never even thought about looking there. A ‘duh’ moment.