Prompt: QuickBooks BAS report cannot be imported. Activity statement for the given QuickBooks BAS report doesn't exist on the ATO.
This is how it works in LodgeiT. When user create activity statement in QuickBooks it becomes available to export from QuickBooks into LodgeiT. This report in QBO has specific period, i.e. start date - end date. In LodgeiT we use this date range to find the activity statement in ATO with exactly that period to download it into LodgeiT and fill with QuickBooks financial data. The error that you received says that the report for this period was not found in ATO.
The issue could occur because either the report is not generated yet in ATO OR the QuickBooks report period is different.
If the issue persists, please mention what period does have the QuickBooks report and check if it also exists in ATO.
In order to do this, please navigate to GST in QuickBooks https://qbo.intuit.com/app/tax/home , there is the list of BAS reports

Select "Prepare BAS" and the report will be opened. It has to be prepared first in QuickBooks (but not "Marked as Lodged") Make sure to fill all required fields and reach the "Summary" page.
Make sure it has the date period, Then, we will investigate further.