Your 1099-B comes from your broker. You might be able to go online to your account and download it or request that it be mailed to you. Sometimes these forms take longer to get.
See this link to import directly into TurboTax. https://www.google.com/search?q=ttlc+how+to+download+from+broker&rlz=1C1CHBF_enUS793US803&oq=ttlc+ho...
