@5year
When I've uploaded to Scoutnet for Boy Scouts and there is an issue I've seen the problem based on the Scoutnet confirmation report. There is basically a 3 step process when uploading. 1st is to get the CSV file uploaded, 2nd is the processing and then the confirmation from Scoutnet of what it's about to upload/apply with the ability to make changes before doing so, 3rd is a confrimation report from Scoutnet that you MUST print in order for the process to be complete.
Also, based on what my Council's Advancement chairman told me is that Scoutnet matches up with First/Last Nam