If the phone number in the My Info section is blank or the wrong number of digits, it might give this error.
To check your phone entry, click on My Info, on the left menu, and to the right of your address, click on the icon of the blue pencil. This will open the screen to edit your address and phone is at the bottom.
Enter your complete and accurate phone number and be sure to press Continue until the section completes and the changes are saved.
If this does not stop the error message, you may need to close your browser and clear your cache/cookies/temporary internet files, or use a different browser.
If this does not stop the error message, this TurboTax FAQ has information and a click-for-email-notification link, at the bottom.