Let me help share a few things which can be the reason why your customers aren't receiving an emailed invoice and guide how to let them receive it successfully.
To start with, consider asking your customers to check the Spam or Junk folders of their email account. Most scenarios from customers, like you, with the same experience, was able to see them after checking these folders.
But if those folders do not contain any emailed invoices, let update your email address to make sure that your customers will receive the invoices. Let me show you how:
Go to the Gear icon.
Under YOUR COMPANY, select AccountandSettings.
On the Contactinfo section, select the Pencil icon.