How to get SKU from Configure Product Custom Option?

Question

I am trying to get custom option value (SKU) from Configure product custom option

$customOptions = $objectManager->get('Magento\Catalog\Model\Product\Option')->getProductOptionCollection($_product);

foreach($customOptions as $optionKey => $optionVal):
               foreach($optionVal->getValues() as $valuesKey => $valuesVal) {
                     // echo //$valuesVal->getId().' '.$valuesVal->getTitle();
                     //print_r($valuesVal->getData());
                     echo $valuesVal->getSku();
                }
endforeach;

but i can't get SKU..

Please assist me.

Answer 1

Please change the code as below

From:

echo $valuesVal->getSKU();

To:

echo $valuesVal->getSku();