So as not to hijack the numerous other threads.
I am having the same issue. I have it on new accounts that were never in my Quicken file. I have it on accounts that worked fine for a while then just stopped working. There is no correlation to any updates, crashes, or changes in access policies with the banks.
I can name seven institutions that have this problem in my account - Citadel CU, Vanguard, Fidelity (but only one of my wife's account credentials), Member's 1st CU, and others.
Completely starting over is not an option. I have years of history and no need or desire for a new email just to create an account. There has to be another way.
And, no, I have not created a new file or Quicken account to test, for the reason above.