Exception while linking a feed to a campaign

[Özgür Nevres]

Hi,

I am getting an exception while linking a feed to a campaign.

feed id: 174838166
campaign id: 19876813904

Request Id: 7gHANeikZiYLWgu0fnfTUA
Error message: The required field was not present.

What am I missing? How can I fix this?

My code is like below:
        var campaignFeed = new CampaignFeed()
        {
            Feed = ResourceNames.Feed(request.CustomerClientId, feedId),
            Campaign = ResourceNames.Campaign(request.CustomerClientId, 
campaignId),
            PlaceholderTypes = { 
PlaceholderTypeEnum.Types.PlaceholderType.Callout },
        };

        var operation = new CampaignFeedOperation() { Create = campaignFeed 
};

        try
        {
            var response = 
campaignFeedService.MutateCampaignFeeds(request.CustomerClientId.ToString(), 
[operation]);
        }
        catch (GoogleAdsException gaex)
        {

        }
    }

Thanks in advance

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