The invoices for your CoachAccountable subscription are only ever sent via email to the account owner, and these are sent to whatever email address that owner has on file in their My Account >> User Profile.
Want another recipient to get those invoices?
There's no way to set this up in CA, BUT you can set up a forwarding rule in the email of the account owner to do just that.
To create an accurate filter for this rule, here is what emails should match on:
|Subject:||CoachAccountable Invoice Receipt|
Make a rule for emails matching this to forward on to whichever other recipients you like, and they'll get those subscription invoices as well.