Unfortunately you can't efile a 2019 amended return using Turbo Tax. They (TT) cut that service off last October. You can prepare an amended return using the product but you have to print it out and mail it in. As an FYI, I did that last August and mailed the amended return to the IRS. It took over six months for it to show up in their system (in the "Where's my amended return?" tool) and now another two months and it still hasn't been processed.
