I completely understand your frustration, ABS-JS1.
Please know that I hear you, and I want to help. Since you're unable to find the American Express Business Checking in the lists of supported Financial Institutions by Intuit, I recommend sending a request to add your bank as a financial institution for Online banking in QuickBooks Online.
You can follow my colleague Jen_D steps on how to send a request to your Bank.
In the meantime, you can add the transactions manually. I've added this reference as your guide: Manually add transactions in QuickBooks Online.
Feel free to browse these links as additional resources for managing banking-related topics:
Reach out to me if you have any other concerns or questions. I’m always ready to answer them for you. Have a good one.
