First we'll try deactivating all of the accounts for the affected FI. You can do so by following the article listed down below.
https://www.quicken.com/support/deactivate-online-banking-services-quicken-account
Once you've done this try importing the QFX file again it should give you the option to add as new or to link to an existing account inside of your file.
Once you've had the chance to try this let us know if we're able to make progress on getting reconnected. From there we'll see what our next steps are.Thanks,Quicken Francisco
Thanks for the update. I am interested that it does this. I'm wondering if we might need to try to see if we need to redo their online sign in again so that it's able to connect to the ML servers again. To start we'll want to sign into the ML website using a specific link they provide. I'll leave the link down below. https://olui2.fs.ml.com/login/signin.aspx
rotermant said: I now suspect that my quicken file is corrupted. When I created a clean "Test" file and linked my ML accounts to it, all transactions downloaded correctly with no error message. Any suggestions on how to examine/validate and best repair my file?