Thanks, I modified the body by your method, now it is working
{
"startInfo": {
"ReleaseKey": "6aa992f0-b39c-4a0d-b02c-ad16f05xxxxx",
"JobsCount": 1,
"JobPriority": null,
"SpecificPriorityValue": null,
"Strategy": "ModernJobsCount",
"ResumeOnSameContext": false,
"RuntimeType": "Unattended",
"RunAsMe": false,
"InputArguments": "{'id':'1'}",
"MachineRobots": [
{
"MachineId": 2459xxx
}
]
}
}