updateorCreate method not working laraval 8

I'm using this code/method update or create in my controller/livewire but I'm getting duplicate primary key error on jquery ajax request.

why its not updating that record.

public function savedata(Request $req){
    return Locations::updateOrCreate(
    [
        'lat' => $req->lat,
        'lng' => $req->lng
    ],

    [
        'salerep_id' => $req->salerep,
        'manager_id' =>  $req->manager
    ]
);}