The following transaction submitted to the Ardor blockchain remained unconfirmed and eventually expired, what is the the reason for this?
{
"senderPublicKey": "...",
"isBundled": false,
"chain": 2,
"signature": "3a49a35627b4ce8a5ac2822b35818f907aec4fd53e79fb02d900d88c0f991c0d71973c434ccaad318a1288a1fb64e53d20dc30de74beb18520c5f4bce06372d4",
"feeNQT": "100000000",
"requestProcessingTime": 0,
"type": 0,
"fullHash": "552ec333deb265d60ccfa4225123106ce4fc8f9a751185c561083b4cd9b14ed3",
"version": 1,
"fxtTransaction": "0",
"phased": false,
"ecBlockId": "18397966223991632613",
"signatureHash": "72caad33596e08e67fe43f42033c0223f9abec9b440b10c07cfd186a037eb972",
"attachment": {
"version.OrdinaryPayment": 0
},
"senderRS": "...",
"subtype": 0,
"amountNQT": "77470950921",
"sender": "12661870821659068934",
"recipientRS": "ARDOR-LHJR-WZVF-VKTX-3PVAA",
"recipient": "1451133144082759191",
"ecBlockHeight": 384416,
"deadline": 60,
"timestamp": 22957813,
"height": 2147483647
}