I'm here to share a reason why Spreadsheet Sync not working for A/R Ageing Detail or invoices.
Currently, we have an ongoing investigation about it. This has been raised to our engineer for further investigation. Rest assured that they are doing their best to fix it as soon as possible.
I'd highly suggest contacting our Support team. This way, you'll be added to the list of affected users and receive email updates on the investigation status.
Log in to your QBO account in a web browser.
Click Help.
Select Contact us.
While waiting for a fix, we can visit this article for a compilation of references while working Spreadsheet Sync in QuickBooks.