I was having the same issue. Here's what I did that worked for me:
1. Logged in to my Fidelity account in Edge
2. In Edge, went to Settings -> Privacy, Search, and Services
3. Turned down Tracking Prevention to Basic
4. Turned off everything under Security
5. Tried the import in TurboTax (made me log into Intuit again)
6. Import was successful after a couple of attempts.
7. Put everything back.
Hope that helps
