Thanks for bringing this one to our attention, KTM92. 

As of now, only the American Express financial institution is supported under Open Banking regulations. If you can't find the AMEX Business Checking on the list, we can always manually import your bank transactions.

Feel free to visit our Banking page for more insights about managing your bank feeds and reconciling accounts.

I'd like to know how you get on after trying the steps, as I want to ensure this is resolved for you. Feel free to reply to this post and I'll get back to you. You have a good one.