Hi Christian,

In the hopes of trying to resolve this issue for you, I would like you to try re-connecting to your bank account.

To do this, please select the pencil icon when you select your bank account in the banking tab, then select Edit Sign In Info.

Proceed to put in your Amex account details and continue.

Sometimes all you need to do is enter your account details again and it will refresh the connection between your bank and QuickBooks Online.

Let us know how that works out for you.

Kristian.