Hello, @MikeA6453, @User_4-6-23, and @Stevenfa33.

I appreciate your time and patience in raising this issue in this thread. I'd like to chime in and give some details about the invoice delivery issue. 

An investigation case was just raised this morning about the unexpected error or the Delivery Server Down message when sending out the forms. Our engineers are currently working to fix the invoice delivery system as soon as possible. 

In the meantime, we'll want to manually download those invoices as PDFs, then send them manually outside of QuickBooks. 

We can also check for status updates about the issue here: https://status.quickbooks.intuit.com/. 

Click on Subscribe to Updates if you want to receive updates about this. 

If you'd like to check your financials in the meantime, I'll add this article in case you need help: Run reports in QuickBooks Online.

Once again, we appreciate your patience as we're working to fix the invoice delivery system. Please let me know if you have more questions about managing your invoices or running some reports. I'm here to help.