unable to recieve notification for news apps and few other apps also,

  1. A1516442251790
    Cupcake Jan 20, 2018

    A1516442251790 , Jan 20, 2018 :
    inhav installed ,delted reinstalled TOI , NDTV apps but i m umable to recieve any notification from these apps,
    m using one plus 3t on latest stable oreo built.can anybody help?