Since many people are able to import successfully, it can be individual variables affecting the ability to import. Contacting TurboTax Support where they can actually get into your return is one solution.
Another is to enter Summary Totals, where you enter one line each for LT/ST totals.
You will be able to Efile, and may just need to mail a copy of your 1099 with Form 8949/8453 later. Here's more info on Mailing Form 8949 for Summary Totals.
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