Conversions API events are not showing up in campaign

Question

I have implemented a solution in our application to send certain events to Facebook Pixel via Conversions API. We are not using the Pixel JS code in our application. All events are sent from the server. We get the Pixel Id and Access Token from the customer and fbclid from the url. We use this data to send events using the Facebook Business SDK.

The events are being sent successfully and the events show up in the Events Manager.

However, the events are not assigned to the Campaigns which use the same Pixel. Has anyone faced this issue before? Please help if someone know the cause for this.

Sample data that we send via the SDK to Facebook.

{
    "data": [
        {
            "event_name": "Lead",
            "event_time": 1662450937,
            "action_source": "chat",
            "event_source_url": "https://test.test",
            "user_data": {
                "fbc": "fb.1.1662386239929.IwAR3NTvPLLPmv9FrKx9tmW1VL_NGjC9CmxxjZJQH5OPke0C2BH2AsldF1M"
            }
        }
    ]
}