Google Ads API Product Link Invitation Reference

[Ansh Ved]

Hi,
I am trying to use the Google AdWords API to accept invitations sent from 
the YouTube Account. 

I have already set up the connection. Using the PHP library for V16: 
https://github.com/googleads/google-ads-php/

I am using this with Laravel

I sent a get request to get the list of product invitation links, but I am 
receiving an empty array. I could successfully fetch campaigns from Google 
ads.

/////////////////// This works well /////////////
public function getAllCampaigns($customerId) 
    {
        $googleAdsServiceClient = 
$this->client->getGoogleAdsServiceClient();
        $query = '
        SELECT campaign.id, campaign.name FROM campaign ORDER BY campaign.id
        ';

        $stream = $googleAdsServiceClient->searchStream(
            SearchGoogleAdsStreamRequest::build($customerId, $query)
        );

        $allCampaigns = [];
        foreach ($stream->iterateAllElements() as $row) {
            $allCampaigns[] = [
                'campaign_id' => $row->getCampaign()->getId(),
                'campaign_name' => $row->getCampaign()->getName()
            ];
        }

        return $allCampaigns; 
    } ///////////////// This does not work /////////////////
public function listPendingYoutubeLinkInvitations($customerId)
    {
        $googleAdsServiceClient = $this->client->
getGoogleAdsServiceClient();
        $query = '
        SELECT product_link_invitation.status, 
product_link_invitation.type, 
product_link_invitation.product_link_invitation_id, 
product_link_invitation.resource_name FROM product_link_invitation
        ';

        $stream = $googleAdsServiceClient->searchStream(
            SearchGoogleAdsStreamRequest::build($customerId, $query)
        );

        $invitations = [];
        foreach ($stream->iterateAllElements() as $row) {
            $invitations[] = $row->getProductLink();
        }

        return $invitations;
    }

I have also tried listing customer_client_invitation and customer_invitation
Everything just gives me an empty array [].


Can someone help me with this ??
Am I missing something?

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