Let's first review your sending forms preferences to ensure that a default email address of your CC person is set up properly. Once completed, let's try creating a dummy invoice and send it to a dummy CC email address.
Go to the Gear icon.
Select Account and Settings.
From the left menu, click Sales.
Go to the Messages section, enter the email address under Copy (Cc) new invoices to address and Blind Copy (Bcc) new invoices to address.
Once done, pick Save.
Hit Done.
You can read through this article to learn more about emailing invoices and other sales forms:
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