Background task and error

Hi,

I am using a background task to import a file and also Imports TUs into a Translation Memory (thanks to the api POST /api/tmservice/tms/{tmId}/import)

The task is well created and executed however only a few TU are imported, as you can see below 11974 TU detected and only 1034 added

{
    "id": "bb9d3273-a4d8-4666-bd60-f7773b39b915",
    "displayName": "Import File-NormativeMem_EN-FI-HU-SV-3/8/2023 10:44:48 AM",
    "type": "TmService.FileImport",
    "settings": {
        "source": "EN-GB",
        "target": "FI-FI",
        "settingsType": "TmService.FileImport",
        "suppressMessagePublishing": false,
        "translationMemoryId": "b7e934f2-e463-4b38-b60d-0d0be20df5f0",
        "alignmentQuality": 0,
        "acronymsAutoSubstitution": false,
        "checkMatchingSublanguages": false,
        "confirmationLevels": [
            "Translated",
            "ApprovedTranslation",
            "ApprovedSignOff"
        ],
        "existingTUsUpdateMode": "AddNew",
        "existingFieldsUpdateMode": "Merge",
        "newFields": "AddToSetup",
        "tuProcessingMode": "ProcessCleanedTUOnly",
        "plainText": false,
        "filter": null,
        "useTmUserIdFromBilingualFile": true,
        "triggerRecomputeStatistics": false,
        "exportInvalidTranslationUnits": false,
        "fileId": "014afce2-d0f8-48df-a78d-6bb43eaa2ec1_EN-FI-DWN.tmx",
        "fileName": "014afce2-d0f8-48df-a78d-6bb43eaa2ec1_EN-FI-DWN.tmx",
        "storageProviderName": "FileSystemStorageProvider",
        "traceId": null
    },
    "details": [
        {
            "key": "Default",
            "status": "Done",
            "statistics": {
                "errors": 10940,
                "addedTranslationUnits": 1034,
                "rawTUs": 11974,
                "totalRead": 11974,
                "duration": "00:00:21.8198885",
                "totalImported": 1034
            }
        }
    ],
    "status": "Done",
    "createdAt": "2023-03-08T10:44:48.1343905+00:00",
    "updatedAt": "2023-03-08T10:45:10.1347364+00:00",
    "ownerId": "5a819aa9-04c0-4dca-9286-7d878793884b"
}

Task details:

Total 11974 Errors 10940
RawTU 11974 Overwritten 0
Added 1034 Discarded 0
Merged 0 Bad 0

At this stage I have no clue why it's only working for 1034.

Does anyone has an idea how to find  some logs/ or the reason ?

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