TurboTax support says it's a problem on Fidelity's end, that they are not accepting my password. But it's the password I always use, so I don't buy that explanation. Support says I can upload Fidelity's pdf from my computer, so I will try that rather than entering the figures manually.
It concerns me that I've just entered my username and password for a financial institution, and that data has gone who knows where. I will change it.
