How to add global negative placements

[cv]

Hi,

I was trying to add placements as a Global Negative List.

I was doing by this.
$placements = ['https://www.youtube.com/channel/UCMwS4p5XhAY9Rhqq7EGGKQA', 
'https://www.youtube.com/channel/UCVHO-W63u8RrXa6BAHxfLtQ',
            'https://www.youtube.com/user/DisneyCollectorBR', 
'https://www.youtube.com/user/Yaronelh'];
        foreach ($placements as $placement_value) {
            $sharedCriterion = new SharedCriterion([
                'placement' => new PlacementInfo([
                    'url' => new StringValue(['value' => $placement_value])
                ]),
                'shared_set' => new StringValue(
                        ['value' => 'customers/XXXX/sharedSets/XXXX'])
            ]);

            $sharedCriterionOperation = new SharedCriterionOperation();
            $sharedCriterionOperation->setCreate($sharedCriterion);
            $sharedCriterionOperations[] = $sharedCriterionOperation;
        }


But this is not allowing me add the Placements.



Thanks,

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