TurboTax error 70001 is a connectivity issue that usually resolves itself. If the issue doesn't resolve on its own, close TurboTax, restart your computer, and reopen TurboTax.
Since the previous suggestion did not solve your problem, consider some other things you can try:
To reset your Internet connection:
If none of these things resolve your problem, you can also contact TurboTax customer support at https://support.turbotax.intuit.com/contact/. We’ll help you connect with the right expert for your specific problem.
Please click Error Code 70001 when using TurboTax Desktop to learn more.