Thank you for reaching out to the Samsung community! We would like to inform you that please follow the simple steps to show notification on lock screen. Navigate to settings>>lock screen and security>>Notifications>>Enable>>Show notifications from>>Enable apps.
Be sure to hit ♡ when you find an answer that works for you. For further assistance, you can get in touch with us via Live Chat option by following- http://livechat.support.samsung.com/Customer_new/IN. You can also connect us via Samsung Members web community by following mentioned url-https://community.samsungmembers.com/en_IN#/
