I just finished a chat with TurboTax chat agent who said YOU CAN NO LONGER E-FILE AN AMENDED 2019 RETURN. He said the 3/25/21 date (which was mentioned by a Turbo Tax "expert" in response to a similar question) is for filing a 2020 return ONLY. Note: The chat agent was emphatic about this. He said mail in is the only option for 2019. Someone at Turbo Tax needs to monitor these question and answer boards to make sure the correct answers are given by Turbo Tax employee "experts."
