Hello there, @9130347640777136.
Currently, the ability to connect the Amazon Business app to your QuickBooks Online UK account is not available. This may be the reason why you're prompted with the error.
In the meantime, you can export your Amazon Business transactions and import them in QuickBooks. Just make sure that the file has either of the following formats:
Once the bank file is ready, start importing the file to your QuickBooks Online company. Here's how:
Keep me posted if you have any other questions with this concern. I'll make sure to get back to you as soon as I can. Enjoy your weekend!