I just tried with no issues. contact support. Try schwab first. then Turbotax
as an alternative you can download as a pdf the 1099-B (directly from schwab not thru Turbotax). you can then enter summary totals in Turbotax. this requires you to submit by mail the 1099-B and IRS form 8453. which turbotax should complete but you'll need to print it out for mailing (not efiled). read the filing requirements
https://www.irs.gov/pub/irs-pdf/f8453.pdf
