I ran into this same issue with both my wife and I having accounts at Fidelity. Fortunately TT only saves in cache memory the last set of credentials you used. I selected another institution, such as Schwab and grabbed my 1099's from there, then I went back to Fidelity for a second go at it. This time around TT finally prompted me to enter credentials again and then was able to put in my wife's and download her 1099's.
