Hello @tribbiani,
Thank you for reaching out to the Quicken Community, though I do apologize that you are experiencing this issue.
To clarify, you are experiencing an issue where no transactions are downloading for your American Express account(s) and you are not receiving any error messages? If so, then first, I suggest that you sign out of your data file completely and then sign back in. In doing so, you will refresh the registration token for your Online Connected Services. Please follow the steps below in order to do so.
Please let me know how this goes!