Hi @paul3108-live-co,
Thank you for bringing this issue to our attention.
We have an open investigation for this exact situation you stated above. With that said, I suggest you contact our Technical Support team for assistance. They can add you to the list of our affected users, and you'll receive a notification email as soon as it's available.
See this article for the steps: Contact QuickBooks Self-Employed Support. Please take note of their hours of operation so you know when they're available.
A workaround that I can provide for you is to export your invoice as a PDF and send it to your customer's using a personal email.
Drop me a comment below if you have other concerns with invoices in your QuickBooks Self-Employed company. I've got your back here in the Community.
