I have over 20 QBO accounts and over 50 American Express cards. About 1/2 of the cards stopped syncing with American Express at the end of October.
This is an ongoing issue where QBO and American Express do not play well together. We need to get a mediator in there so that this stops happening. It is a nightmare to have to download and upload transactions from 20+ accounts every week.
The error I see is : There's a problem with this account connection We’re having trouble getting your bank data. Please try again later. (355)"
Please do not respond telling me how to download transactions manually, I know how to do that!