Can you please check the number of transaction lines on your 1099? If the total number is 1000+ (including interest and dividends), then TurboTax Desktop does not support 1,000+ lines. In that case, please summarize your transactions.
You will need to summarize them by the holding period: short-term or long-term. As well as basis reported or not reported to the IRS. All that information is broken down for you on Form 1099-B.
When summarizing noncovered transactions, the IRS requires that either 1099-B is attached to the return or mailed to the IRS together with Form 8453.
Here is an article that will help you enter that information.
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