Thank you for being a part of Samsung community. We would like to inform you that kindly navigate to Settings >> Apps >> 3 dots >> App permission >> contacts >> enable whatsapp .Then launch the whatsapp and referesh it. Be sure to hit ♡ when you find an answer that works for you. For Further assistance, you can also connect us via Samsung Members web community by following mentioned url-https://community.samsungmembers.com/en_IN#/
