This solution is for Mac users.
I just had the same problem, but fortunately was able to solve the problem. You need to add the current TurboTax program to the Access Control Box.
Open Keychain Access?
Under Keychain in the upper left column, click "login"
Under Category in the lower left column, click "passwords"
In the main body on the right side locate "Intuit ID"and double click
When the box pops up click "Access Control" (you may need to enter your login password)
Click the + located in the lower left corner
Type in the current TurboTax, i.e. TurboTax 2018
Click "Save"
You should then be able to type in the login password to allow access to the program.
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