how to resolve error while creating work items using Azure devops API - azure-devops-rest-api

Question

I need help in creating a work item with the following PowerShell script, however I get this error:
Invoke-RestMethod : The remote server returned an error: (401) Unauthorized.
At C:\AutoWICreate1.PS1:64 char:11
$result = Invoke-RestMethod -Uri $uri -Method Patch -Body $json -Cont ...
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
CategoryInfo : InvalidOperation: (System.Net.HttpWebRequest:HttpWebRequest) [Invoke-RestMethod], WebEx
ception
FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShell.Commands.InvokeRestMethodCommand
Below is the script:
param(
[string]$baseurl = "http://tfs.com:8080/tfs/collection",
[string]$projectName = "teamproject",
[string]$keepForever = "true",
[string]$user = "user-name",
[string]$token = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
[string]$title = "POCAutoCreation"
)
Base64-encodes the Personal Access Token (PAT) appropriately
$base64AuthInfo = [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes(("{0}:{1}" -f $user,$token)))
function CreateJsonBody
{
$value = #"
[
{
"op": "add",
"path": "/fields/System.Title",
"value": $title
},
{
"op": "add",
"path": "/fields/System.Tags",
"value": "Tag0921;Tag0926;Tag0927;Tag0928"
},
{
"op": "add",
"path": "/fields/Microsoft.VSTS.Common.Activity",
"value": "Development"
},
{
"op": "add",
"path": "/fields/Microsoft.VSTS.Scheduling.Effort",
"value": "8"
},
{
"op": "add",
"path": "/fields/Microsoft.VSTS.Common.ValueArea",
"value": "Business"
},
{
"op": "add",
"path": "/fields/Microsoft.VSTS.Common.Severity",
"value": "3 - Medium"
},
]
"#
return $value
}
$json = CreateJsonBody
$uri = "$baseurl/$($projectName)/_apis/wit/workitems/"+"$"+"bug?api-version=5.0"
Write-Host $uri
$result = Invoke-RestMethod -Uri $uri -Method Patch -Body $json -ContentType "application/json-patch+json" -Headers #{Authorization=("Basic {0}" -f $base64AuthInfo)}