I'm trying to connect/link my American Express credit card to Quickbooks online. It's giving me a error message.

Thanks for checking the error on your end, @ABHandshake. I can see there are specific cases or ongoing investigations about the issues you're having with the connection option under the Banking page in QuickBooks Online.

I can see the challenges you encountered under the banking section and the urgency of viewing them as quickly as possible. For now, there isn't a specific time frame for when the issue will be resolved. Our engineering team doubles their time to settle the error as soon as possible. 

As a workaround, we can download transactions manually. Follow the steps below:

1. On the left pane, select the Banking menu. 
2. Choose the blue tile for the account you want to upload the transactions into.
3. Click the Link account ▼ dropdown and then Upload from the file.
4. Select the Drag and drop or select files.
5. Follow the onscreen instructions. 

For additional reference, visit this article for your guide: Manually upload transactions into QuickBooks Online.

Furthermore, it would be best to contact our support team. This way, they can add you to the involved users. Feel free to follow the steps provided by my colleague above.

Additionally, here's an article that will guide you through categorizing transactions and reconciling your account. 

• Categorize online bank transactions in QuickBooks Online.
• Reconcile an account in QuickBooks Online.

Following the steps above will allow you to receive updates on the available fix. If you have any specific questions or need assistance with a particular topic, feel free to ask, and I'll do my best to help you.