I got this working, here is the code encase anybody has the same problem:
function copy_Dev_settings( $field ) {
if ( is_edit_page(‘new’) ) { // only populate for new posts
//echo “this is a new post!! <br />”;
if( have_rows(‘deliverables’, ‘option’ )){ // if there are values on the settings page for this option
$value = array();
while ( have_rows(‘deliverables’, ‘option’) ) : the_row(); //starting at a specific row
if( get_row_layout() == “new_deliverable” ){ //set the layout for the flexible content field
$acf_fc_layout = ‘new_deliverable’; //set the values for layout and each sub field
$deliv = get_sub_field(‘deliverables’);
$days = get_sub_field(‘days’);
if ( $acf_fc_layout == ‘new_deliverable’ ) { // apply the values to the correct layout and fields using the key value for that sub field
$value[] = array(
‘acf_fc_layout’ => $acf_fc_layout,
‘field_5d0c21f3e31e1’ => $deliv,
‘field_5d0c220ce31e2’ => $days
);
}
}
else {
echo “cannot find development deliverables row layout”;
//echo “<br />”;
}
endwhile;
$field[‘value’] = $value; //assign the values to the field value array
}
else
echo “nothing”;
}
return $field; //return the full field array to the page/post etc
}
add_filter(‘acf/load_field/key=field_5d0b74c37ad29’, ‘copy_Dev_settings’);
