Hi,i have added all the SKU individually on all products variant but on that product which have one variant its shows SKU but otherone is not showing SKU Please Check and Reply me soon
Could you please check how it works with some default WordPress themes like TwentyTwenty or WooCommerce Storefront to understand is it our theme issue or not?
You have checked with the default theme and the issue still remains. It means it is not our theme issue. Please contact the woocommerce community in this regard. They will guide you better because this functionality comes from WooCommerce.