Why my build buildAudienceType is APP_STORE_ELIGIBLE but not avaiable for testing on testflight?

Here is my build information. It's showing it has been processed and APP_STORE_ELIGIBLE. But on testflight it's showing not available for testing,

![]("https://developer.apple.com/forums/content/attachment/940d838e-e0b6-4610-b191-20c7bcc7bc8c" "title=截屏2023-02-24 下午4.32.59.png;width=2442;height=340")

{
    "data": {
        "type": "builds",
        "id": "3cceb2a0-a225-4f4b-94ea-3aa5c1b01be0",
        "attributes": {
            "version": "4.6.1",
            "uploadedDate": "2023-02-24T14:32:10-08:00",
            "expirationDate": "2023-05-25T14:32:10-07:00",
            "expired": false,
            "minOsVersion": "10.13",
            "lsMinimumSystemVersion": "10.13",
            "computedMinMacOsVersion": null,
            "iconAssetToken": {
                "templateUrl": "https://is3-ssl.mzstatic.com/image/thumb/Purple126/v4/bd/5d/15/bd5d1503-24b7-285f-e909-56e53ece2e1c/icon.png/{w}x{h}bb.{f}",
                "width": 1024,
                "height": 1024
            },
            "processingState": "VALID",
            "buildAudienceType": "APP_STORE_ELIGIBLE",
            "usesNonExemptEncryption": null
        },
}