Try setting ‘parent’ to the field key of the ‘layouts’ of the flex fields.
Here is the portion of an exported field group with a flex field.
'fields' => array( array( 'key' => 'field_54fca97e88819', 'label' => __('Panels'), 'name' => 'blunt_panels', 'prefix' => '', 'type' => 'flexible_content', 'instructions' => '' 'required' => 0, 'conditional_logic' => 0, 'wrapper' => array( 'width' => '', 'class' => '', 'id' => '', ), 'button_label' => __('Add Panel'), 'min' => '', 'max' => '', 'layouts' => array( array( 'key' => '54fca987f37a3', // <= try this key as the parent 'name' => '1_column_simple',
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