This works!! The important part is to have the download for Quickbooks R4 (this needs to be BOLDED and put at the top of the thread) via the link provided by the tech who helped out JB70

Important NOTE:

"Just a note that the problem begins with the R5 update which was what installed with my QB2020 for Mac ."

However, one glitch on my end. QB sends the invoice to Mail, it pops up in Mail and then Mail sends it automatically not leaving the email open to review and edit, etc. Any ideas on that one? That is basically the same as the "custom email" work around. NOT really what I was hoping for. Maybe it is a setting in Mail??