I have the same problem. I downloaded turbotax software on my old computer and prepared and filed the 1040 for 2019.
To prepare my 1040 for 2020 I bought a new MacBook air.
I downloaded 2019 turbo software on this new MacBook Air. But there was a problem with this computer and returned it to Apple for another MacBook Air. I downloaded the 2019 turbotax software onto this MacBook Air. Unfortunately I had problem with this computer also. So I decided and I bought a MacBook Pro . I downloaded 2019 turbotax software and entered activation code. But it rejected it because I used up my activation limit on 5 computer . I think turbotax rejecting because I used tax activation on two MacBook Air computers which I returned to Apple. Now , how can I explain this to Turbotax
