Hey there, info93.

Thanks for taking the time to visit the Community. I'd be glad to provide some insight on your question about your customers not receiving their emailed invoices.

To isolate this issue, I recommend clearing the cache in the internet browser first. The cache can become bogged down with older data, which can potentially cause performance errors in QuickBooks Online. This article will walk you through the process, depending on which browser you're using: https://quickbooks.intuit.com/community/Getting-Started/How-do-I-clear-my-browser-cache-and-temporar....

If the problem persists after trying this, it may be related to a known issue. The engineers are aware and are working hard to get this resolved as quickly as possible. I recommend calling in to speak with a member of the Support Team. An agent will be able to add you to the list of affected accounts. Once you've been, you'll then receive email notifications regarding the fix. The number to speak with an agent is 1-800-488-7330. The most up-to-date contact information can be found here: https://help.quickbooks.intuit.com/en_US/contact.

With this information you'll be back up and running soon. Please don't hesitate to contact me if you have any other questions.