defaulting opportunity fields from the contact
                    
 When a user selects new opportunity from the contact detail, I can't seem to get some opportunity fields to default from the contact by using...
                JoinFieldValue('<Contact>', [<KeyContactId>], '<ContactFirstName>')
Copy enabled is checked on the field on the contact, but it's almost as if the Opportunities Primary Contact ID is not set at creation /defaulting time? 
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