Why when we send invoices we get delivery error

Hey there  aimanelboghdadi,

Welcome to the QuickBooks Community! Thanks for reaching out to us here. being able to send invoices without running into any issues is important. However, this is currently a known issue within QuickBooks today. Our engineers are working to get this resolved as soon as possible. You can receive status updates by clicking on this link. In the mean time you can follow the steps below to continue sending out invoices to your customers.

1. Select the invoice and go to View/ Edit
2. Go to the bottom of the invoice and select Print/ Preview
3. Select Download
4. Then send the download via your email

If you have any other questions, feel free to reach back out to us here.