I have also not been able to import from Betterment this year (2019 tax year). I am using TurboTax Desktop. In past years I had no problem, but for some reason this year is failing. According to what I have been able to find online, including the information on Betterment's site, there may be a problem if you have more than 1500 transactions for TurboTax online. TurboTax desktop, either has no limit or 2500 transactions (I see different answers on different sites). Either way, I should be well under all of those limits, so that should not be the problem.
@GiseleD 's proposed solution is simply untenable for even low hundreds of transactions, and I hope that this is only a temporary problem. If it is more than that, I may well be requesting a refund, as this is critical functionality.
