The QuickBooks Online API failed to respond after multiple attempts. Please try again soon.

As I know, there is no duplicate feature available. You will have to purchase a third party service to duplicate your data or use a migration tool.

https://get.transactionpro.com/qbo

Hi there. I can see how time-consuming it can get dealing with error messages. Don't worry, I'll be glad to point you in the right direction from here. To make sure we're both on the same page, are you having this issue while using a private/incognito browser window?