Hey there, Mark. Your clients will receive two notifications of their invoices if you enter their email twice in the To Cc/Bcc section before sending it to them. You'll also be notified if you tick the Send me a copy option.
If this isn't the case, I recommend contacting the QuickBooks Self-Employed (QBSE) Live Support Team to help cate the root cause of the issue when sending invoice emails to your clients.
Here's how:
In the upper right corner, select the (?) Help icon beside the Assistant tab.
Click the Contact Us option below.
Enter a brief description of your concern and select Continue.
Feel free to return here if you have additional questions about managing your invoice emails or any related concerns. We'll be willing to help you as soon as possible.
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