Please see TurboTax Alumni Expert JulieS's answer to a similar question.
"It depends on whether you are using TurboTax Online, or TurboTax software installed on your computer.
If you are using TurboTax Online, you are trying to import the form from your computer to the TurboTax Online website, so you would need to be connected to the internet.
If you are using TurboTax software, and you are starting by entering your EIN on the page that says, Let's start with a bit of info from your W-2, the program is trying to pull the information from your employer, not from the PDF on your computer.
Make sure that this is where you are trying to upload your PDF:
If this doesn't resolve the issue you are having, respond back and TurboTax can help you further. "
See TurboTax Alumni Expert JulieS's original post HERE.