I have the same issue. How was this resolved? I have an iMac running 10.15.3. I have no anti-virus that I know if running. I have deleted the entire program with Clean My Mac, I have run clear cache with Clean My Mac, and I have run disk repair with Clean My Mac. I reloaded 2019 TurboTax, and I still get this error code when I enter my license. This has now taken me longer than it takes to do my taxes.
