I am trying to update the variable group using below method

PUT https://dev.azure.com/{organization}/_apis/distributedtask/variablegroups/{groupId}?api-version=7.2-preview.2

But its not working for me in powershell can some one help me to fix this

Script

# Parameters
$organization = "nprod"
$project = "APM"
$pat = "shgksdghiddsfgdertwetrweghdhfgkhsd"  # Your PAT token
$variableGroupName = "Test-Variable-group"
$outputValue = "DaaS"
# Headers for API requests
$headers = @{
    "Content-Type"  = "application/json"
    "Authorization" = "Basic " + [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes(":$($pat)"))
}
# Get the list of variable groups to find the ID
$uri = "https://dev.azure.com/$organization/$project/_apis/distributedtask/variablegroups?api-version=6.0-preview.2"
$response = Invoke-RestMethod -Uri $uri -Method Get -Headers $headers
$variableGroup = $response.value | Where-Object { $_.name -eq $variableGroupName }
if ($null -eq $variableGroup) {
    Write-Error "Variable group '$variableGroupName' not found."
    exit 1
}
$variableGroupId = $variableGroup.id
# Construct the body for the update
# First, get the existing variables to avoid overwriting the
$existingVariables = @{}
$variableGroup.variables | ForEach-Object {
    if ($_.Key -ne $null -and $_.Value -ne $null) {
        $existingVariables[$_.Key] = $_.Value
    } else {
        Write-Warning "Skipping variable with null key or value."
    }
}
# Add or update the specific variable
$existingVariables["stoppedCjobs"] = @{
    value = $outputValue
}
$body = @{
    id = $variableGroupId
    name = $variableGroupName
    type = "Vsts"
    variables = $existingVariables
} | ConvertTo-Json -Depth 10
# Update the variable group
#PUT https://dev.azure.com/{organization}/_apis/distributedtask/variablegroups/{groupId}?api-version=7.2-preview.2
$uri = "https://dev.azure.com/$organization/$project/_apis/distributedtask/variablegroups/$variableGroupId"+"?api-version=7.2-preview.2"
$response = Invoke-RestMethod -Uri $uri -Method Put -Headers $headers -Body $body
if ($response -ne $null) {
    Write-Output "Variable group updated successfully."
} else {
    Write-Error "Failed to update the variable group."
}

And getting error like

WARNING: Skipping variable with null key or value.
Invoke-RestMethod : {"$id":"1","innerException":null,"message":"Project information name is not valid for variable group.","typeName":"System.ArgumentException, 
mscorlib","typeKey":"ArgumentException","errorCode":0,"eventId":0}
At line:44 char:13
+ $response = Invoke-RestMethod -Uri $uri -Method Put -Headers $headers ...
+             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (System.Net.HttpWebRequest:HttpWebRequest) [Invoke-RestMethod], WebException
    + FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShell.Commands.InvokeRestMethodCommand

want to figure this out issue