I was having EXACTLY the same issue when I attempted to import my tax forms from Vanguard and Ally up until 2 days ago. Then I did two things that fixed the problem: 1. I turned off my ExpressVPN. 2. I downloaded the most current version of TurboTax (for MacOS) which was version 2024.r16.018 (Jan 30th build date.). Not sure exactly which of those steps worked, but I was able to download BOTH my Ally and Vanguard Brokerage tax information right away with NO issues whatsoever!!!
