I just talked to someone "live" at TurboTax who told me that the form 8615 line 7 error is getting fixed tomorrow, April 3, 2020. I had the same issue. The taxes were rejected by the IRS (and the state) and then I waited until March 19 and resubmitted only to have it rejected again. I was not going to file another time only to have it rejected again. She suggested that I re-do the form this weeked.
