AWS M12: Unable to register datasets

I am getting an error when I attempt to register a dataset. Below is an example request that is failing:

curl --location --request PUT 'https://r3m12.preshiptesting.osdu.aws/api/dataset/v1/registerDataset' \
--header 'data-partition-id: osdu' \
--header 'Content-Type: application/json' \
--header 'Authorization: Bearer ...' \
--data-raw '{
    "datasetRegistries": [
        {
            "id": "osdu:dataset--File.Generic:3f859d80-b789-41da-ab66-8bda9a832926",
            "kind": "osdu:wks:dataset--File.Generic:1.0.0",
            "acl": {
                "viewers": [
                    "data.default.viewers@osdu.example.com"
                ],
                "owners": [
                    "data.default.owners@osdu.example.com"
                ]
            },
            "legal": {
                "legaltags": [
                    "osdu-public-usa-dataset-1"
                ],
                "otherRelevantDataCountries": [
                    "US"
                ],
                "status": "compliant"
            },
            "data": {
                "DatasetProperties": {
                    "FileSourceInfo": {
                        "Name": "Volve_Official_Faults.dat",
                        "FileSource": "s3://r3m12-shared-561735291427-us-east-1-file-dms/osdu/8WvMLwjTCX4t7oPKrKJp566UKOysg43z/Volve_Official_Faults.dat",
                        "PreLoadFilePath": ""
                    }
                },
                "ResourceSecurityClassification": "osdu:reference-data--ResourceSecurityClassification:RESTRICTED:"
            },
            "meta": [],
            "tags": {}
        }
    ]
}'

Response:

{
    "code": 500,
    "reason": "Server error.",
    "message": "An unknown error has occurred."
}

I have verified that the file referenced in the FileSource path s3://r3m12-shared-561735291427-us-east-1-file-dms/osdu/8WvMLwjTCX4t7oPKrKJp566UKOysg43z/Volve_Official_Faults.dat is valid and accessible:

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