Error while trying to create a release definition using Azure DevOps Rest API - powershell

Question

I am using below script to create a release definition in Azure DveOps with a PowerShell script, but its failing with error message as below. Not sure where am giving incorrect details.
Invoke-RestMethod :
{"$id":"1","innerException":null,"message":"VS402903: The specified
value is not convertible to type ReleaseDefinition. Make sure it is
convertible to type ReleaseDefinition and try again."
Code snippet is:
Param(
[string]$organisation = "ORGNAME",
[string]$project = "PROJECTNAME",
[string]$keepForever = "true",
[string]$user = "userid",
[string]$token = "tokenID" )
$base64AuthInfo = [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes(("{0}:{1}" -f $user,$token)))
Write-host $base64AuthInfo
$postresults = "https://vsrm.dev.azure.com/$organisation/$project/_apis/release/definitions?api-version=6.0"
Write-host $postresults
$body =
#"
{ "name": "New release pipeline ",
"comment": "test",
"definitionId": 860,
"description": "Create Release from PowerShell",
"artifacts": [],
"isDraft": false,
"reason": "Demo purpose",
"manualEnvironments": null,
"environmentsMetadata": null,
"properties": null,
"variables": null
"environments": [
{
"name": "PROD",
"preDeployApprovals": {
"approvals": [
{
"rank": 1,
"isAutomated": false,
"isNotificationOn": false,
"approver": {
"displayName": null,
"id": ""
},
"id": 0
}
]
},
"postDeployApprovals": {
"approvals": [
{
"rank": 1,
"isAutomated": true,
"isNotificationOn": false,
"id": 0
}
]
},
"deployPhases": [
{
"deploymentInput": {
"parallelExecution": {
"parallelExecutionType": "none"
},
"skipArtifactsDownload": false,
"artifactsDownloadInput": {},
"queueId": 391,
"demands": [],
"enableAccessToken": false,
"timeoutInMinutes": 0,
"jobCancelTimeoutInMinutes": 1,
"condition": "succeeded()",
"overrideInputs": {}
},
"rank": 1,
"phaseType": "agentBasedDeployment",
"name": "Run on agent",
"workflowTasks": []
}
],
"retentionPolicy": {
"daysToKeep": 30,
"releasesToKeep": 3,
"retainBuild": true
}
}
],
"path": "\\",
"releaseNameFormat": "Release",
"description": ""
}
"# | ConvertTo-Json -Depth 100
$result = Invoke-RestMethod -Uri $postresults -Method Post -Body $body -ContentType "application/json" -Headers #{Authorization=("Basic {0}" -f $base64AuthInfo)}
if ($result.count -eq 0)
{
throw "Unable to locate Release Definition Id $($definitionId)"
}
else
{
Write-host "Success!!!"
}

Answer 1

You have few issues in the json body:
The description exist twice.
You have missing , near the "variables": null.
You need to specify a valid id in the preDeployApprovals:
"approver": {
"displayName": null,
"id": "PUT-HERE-ID"
},
Add the above section also to the
You don't need to convert it again to json, remove the | ConvertTo-Json -Depth 100 from the code.