Bad request: Attempting to associate a ugc with an asset that's not owned by the author

I'm trying to migrate my app from LinkedIn API v1 to v2. I'm currently looking at sharing images (natively) to my personal LinkedIn profile.

I'm following the official docs here: https://learn.microsoft.com/en-us/linkedin/consumer/integrations/self-serve/share-on-linkedin#create-an-image-share

To register the image I made the following POST request: to https://api.linkedin.com/v2/assets?action=registerUpload

{
    "registerUploadRequest": {
        "recipes": [
            "urn:li:digitalmediaRecipe:feedshare-image"
        ],
        "owner": "urn:li:person:9PyfTxBTFY",
        "serviceRelationships": [
            {
                "relationshipType": "OWNER",
                "identifier": "urn:li:userGeneratedContent"
            }
        ]
    }

}

I got the success response:

{
    "value": {
        "uploadMechanism": {
            "com.linkedin.digitalmedia.uploading.MediaUploadHttpRequest": {
                "headers": {},
                "uploadUrl": "https://api.linkedin.com/mediaUpload/C4D22AQEGOHxBzKUXvw/feedshare-uploadedImage/0?ca=vector_feedshare&cn=uploads&m=AQLhYJm0KOaTCgAAAWhSDplI-Lzlfh7lOsd8D5qBcz0aJ2bf1fwIfnh8ow&app=5212106&sync=0&v=beta&ut=0rKn179ebIA8A1"
        }
    },
    "mediaArtifact": "urn:li:digitalmediaMediaArtifact:(urn:li:digitalmediaAsset:C4D22AQEGOHxBzKUXvw,urn:li:digitalmediaMediaArtifactClass:feedshare-uploadedImage)",
    "asset": "urn:li:digitalmediaAsset:C4D22AQEGOHxBzKUXvw"
    }
}

I successfully uploaded an image as binary using the returned uploadUrl:

curl -i --upload-file PATH_TO_FILE --header "Authorization: Bearer TOKEN" 'https://api.linkedin.com/mediaUpload/C4D22AQEGOHxBzKUXvw/feedshare-uploadedImage/0?ca=vector_feedshare&cn=uploads&m=AQLhYJm0KOaTCgAAAWhSDplI-Lzlfh7lOsd8D5qBcz0aJ2bf1fwIfnh8ow&app=5212106&sync=0&v=beta&ut=0rKn179ebIA8A1'

To confirm that the image is ready for use, I checked the status of the asset with the GET https://api.linkedin.com/v2/assets/C4D22AQEGOHxBzKUXvw which returned

{
    "serviceRelationships": [
        {
            "identifier": "urn:li:userGeneratedContent",
            "relationshipType": "OWNER"
        }
    ],
    "recipes": [
       {
            "recipe": "urn:li:digitalmediaRecipe:feedshare-image",
            "status": "AVAILABLE"
        }
    ],
    "mediaTypeFamily": "STILLIMAGE",
    "created": 1547564914979,
    "lastModified": 1547564994321,
    "id": "C4D22AQEGOHxBzKUXvw",
    "status": "ALLOWED"
}

Based on the docs, I can now simply reference the asset URN in the UGC post.

This is the test image post I'm trying to share using the https://api.linkedin.com/v2/ugcPosts endpoint

{
    "author": "urn:li:person:9PyfTxBTFY",
    "lifecycleState": "PUBLISHED",
    "specificContent": {
        "com.linkedin.ugc.ShareContent": {
            "shareCommentary": {
                "text": "Testing LinkedIn image shares"
            },
            "shareMediaCategory": "IMAGE",
            "media": [
                {
                    "status": "READY",
                    "description": {
                        "text": "Some text"
                    },
                    "media": "urn:li:digitalmediaAsset:C4D22AQEGOHxBzKUXvw",
                    "title": {
                        "text": "Some title"
                    }
                }
            ]
        }
    },
    "visibility": {
        "com.linkedin.ugc.MemberNetworkVisibility": "PUBLIC"
    }
}

But I keep getting the error:

{
    "message": "Attempting to associate a ugc with an asset that's not owned by the author",
    "status": 400
}

The above request works perfectly when trying to share a status update or a link attachment.

I haven't tried it with videos yet (similar approach) since I assume I will face the same problem. I haven't tried sharing as an organization either since I need to be accepted to the LinkedIn Marketing Developer Program first.

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