Hi there, Rick. There’s currently no option to send invoices directly from QuickBooks to your customers' MYOB accounts, as these are separate accounting systems. Invoices created in QuickBooks can only be shared with your customers via email and will not automatically sync or appear in their MYOB accounts.
To make sure your customers received the email, ask them to check their inbox, as well as their spam or junk folders, as it may have been overlooked or filtered. If they confirm they didn’t receive the email, you can try troubleshooting the issue by checking out this article: 3 solutions for when customers aren't receiving your emails.
If you have any other questions or concerns, feel free to reply to this message. The community team is here to help!