Hello @annenice
Thank you for reaching out to the Community regarding your issue, although I am sorry to hear that you are experiencing issues with your AmEx reconciliation. I'm wondering here if we might need to deactivate and reactivate the account in order to get it getting the proper online balance. You may have already done this but let us know if you have. I'll leave instructions down below.
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-accountOnce all the accounts are deactivated go ahead and follow the article here on reconnecting the accounts.https://help.quicken.com/pages/viewpage.action?pageId=3216277
Once you get a chance to try these steps, please let us know what you find. From there we'll better understand our next steps.
Thanks,
Quicken Francisco