I've had this happen to me many times filing while trying to e-file in 2019 & 2020. I find that the system is being updated either on the federal or state or TurboTax side. What I recommend to do is save your tax file, close out, give it a few hours or day or 2 days and come back and the system will ask you to update and you should be able to e-file thereafter. Sometimes, it can take up to 2 days (this has happen to me before). Be patient. I know it's nerve wrecking.
