ok so it sounds as tho you entered the 1099 as "sales summary" with just the totals but using some adjustments (code W etc)? when you put it into TT like this, it will create Form 8949 with a summary entry to show the adjustment, but triggers the need to mail in the statement as the individual details on that form are missing (dates etc). The Form 8949 may say something like "see attached statement" in the first column. And that triggers Form 8453. It sounds like it's referring to those wash sales if that's the only adjustment category used showing on the 8949 referring to "see attached statement" etc. If your return was accepted then I think you're in good shape and just mail in the 8453 either with the entire 1099 or just the pages with those items and celebrate.
for future filings if you encounter this again, entering the wash sales as "one by one" will put those on 8949 with the specific details of each sale; and then subtract those from your totals and put the remaining balance of the 1099 in separately as a "sales summary", it will all be consolidated on Schedule D and no Form 8453 should be needed.
