After four support calls with TurboTax, we arrived at the workaround of using TurboTax Premiere online. I was able to successfully import my Betterment tax documents to the online version. I did not then download the TurboTax return to my desktop version as I would then be unable to use my 2018 return with my new 2019 return (cannot merge two returns with a new return). I had to stay with the TT Premiere online, upload my 2018 TT return, import Betterment forms, and re-enter all of my other 2019 tax information. Note that I have used TT Deluxe desktop for the past three years with no problems importing from Betterment, but had to upgrade to TT Premiere online in order to process my schedule D.
TurboTax support gave me codes for the free use of TT Premiere online in consideration of my being unable to use the TT Deluxe desktop app I had purchased.
