I am attempting to pass user_id along with the client ID. But this doesnt seem to be working for me.

When i remove the User_id and just pass a client ID i can find the event available in real time reports and in a few days avaialble in events page. But when i add the User_Id this is not getting populated.

What could be the issue?

    {
    "client_id": "1494455746.1729597931",
"user_id": "4a31cbb0-2d2c-4fe5-9d8e-c72d7db32ce7",
    "events": [
        {
        "name": "test_senario_5",
        "params": {
            "segment_sync_date": "2024-09-09",
            
            "debug_mode": true
        }
        }
    ]
    }