This became an issue several months ago. I have two savings accounts through American Express - Banking. Initially, the issue was worked on for weeks and Quicken finally announced it to be resolved. Nope! It's never worked correctly since early July '24.
In the beginning after the "fix", I had an issue such as this: I transfer funds from one of my AMEX -Banking accounts to an external account. The amount would show as being transferred out of BOTH of my AMEX - Banking accounts. I would recognize and simply "delete" the match for the amount in error.
That was bad enough, but as of the past few days, I'm back to not being able to use OSU to download transactions from American Express - Banking AT ALL. AGAIN!!
Back to the "oops" Error.
What is the issue between American Express and Quicken? Holy Crow!😫