I know you've spent a lot of time on this already, @qed1967.

I'll be providing details about the status of the issue of customers being unable to receive invoices.

Currently, the issue of customers' not receiving invoices is still ongoing. Our engineers are now working diligently to provide a permanent fix.
 

For now, we are unable to provide an exact time frame when this will be fixed. I suggest contacting our QuickBooks Support Team if you haven't reached them. This is to ensure they can add you to our notification list. This will help our engineers determine the number of affected users. You'll also receive an update via email once this has been resolved.

Lastly, you may refer to this article to see details on how the Sales page helps you to view all sales transactions and invoice status at a glance: View sales transactions.

If you need further assistance regarding your QuickBooks Online transactions, you can always leave a comment below. Stay safe.