Azure PowerShell脚本报错：Identity参数为空字符串问题排查

初始脚本 #

我编写了一段PowerShell脚本，用于登录Azure并根据用户输入的邮箱地址为用户分配组通话成员权限，脚本内容如下：

Function SetUser
{
    $script:user = Read-Host -Prompt "Enter the user's email address"    

    Write-Host "You set the email address as '$user'." -ForegroundColor yellow
}

Function Assigndelegate($user)
{
    $job = Start-Job -ScriptBlock {
    param($user)
    New-CsUserCallingDelegate -Identity $identity -Delegate $user -MakeCalls $true -ReceiveCalls $true -ManageSettings $false 
} -ArgumentList $user
    while ($job.State -eq 'Running') {
        Write-Host "Connecting to Azure..."
        Wait-Job -Job $job
    }
    $result = Receive-Job $job

    (Get-CsUserCallingSettings -Identity $user).Delegators | ft -Property Id, MakeCalls, ReceiveCalls, ManageSettings
}


Connect-MicrosoftTeams

$script:identity = "user@contoso.com"
SetUser
Assigndelegate $user

初始运行错误 #

运行该脚本时出现以下错误：

Cannot bind argument to parameter 'Identity' because it is an empty string.
    + CategoryInfo          : InvalidData: (:) [New-CsUserCallingDelegate], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationErrorEmptyStringNotAllowed,New-CsUserCallingDelegate
    + PSComputerName        : localhost

我清楚脚本无法读取$identity变量，但不清楚具体原因：尝试使用$global:前缀（尽管后续该变量会变化，这种方式并不理想），仍出现相同错误；直接写入变量值则可正常运行。

添加参数后的错误 #

当我在param和ArgumentList中定义Identity参数后，错误变为：

Cannot bind argument to parameter 'Identity' because it is an empty string.
    + CategoryInfo          : InvalidData: (:) [New-CsUserCallingDelegate], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationErrorEmptyStringNotAllowed,New-CsUserCallingDelegate
    + PSComputerName        : localhost
 
Get-CsUserCallingSettings : Cannot process argument transformation on parameter 'Identity'. Cannot convert value to type System.String.
At line:36 char:42
+     (Get-CsUserCallingSettings -Identity $user).Delegators | ft -Prop ...
+                                          ~~~~~
    + CategoryInfo          : InvalidData: (:) [Get-CsUserCallingSettings], ParameterBindingArgumentTransformationException
    + FullyQualifiedErrorId : ParameterArgumentTransformationError,Get-CsUserCallingSettings

更新后的脚本及问题 #

修改参数列表后，我仍遇到错误，更新后的脚本如下：

#Set the user
Function SetUser
{
    $script:user = Read-Host -Prompt "Enter the user's email address"    

    Write-Host "You set the email address as '$user'." -ForegroundColor yellow
}

Function Assigndelegate($user, $identity)
{
    $job = Start-Job -ScriptBlock {
    param($user, $identity)
    New-CsUserCallingDelegate -Identity $identity -Delegate $user -MakeCalls $true -ReceiveCalls $true -ManageSettings $false 
} -ArgumentList @($user, $identity)


    while ($job.State -eq 'Running') {
        Write-Host "Connecting to Azure..."
        Wait-Job -Job $job
    }
    $result = Receive-Job $job

    #(Get-CsUserCallingSettings -Identity $user).Delegators | ft -Property Id, MakeCalls, ReceiveCalls, ManageSettings

}


Connect-MicrosoftTeams

$script:identity = "user@contoso.com"
SetUser
Assigndelegate $user, $identity

简化测试后的问题 #

根据建议简化脚本后：

Function SetUser
{
    $script:user = Read-Host -Prompt "Enter the user's email address"    

    Write-Host "You set the email address as '$user'." -ForegroundColor yellow
}

Function Assigndelegate($user, $identity)
{
 Write-Output $identity

}

$script:identity = "user@contoso.com"
SetUser
Assigndelegate $user, $identity

运行后除了提示You set the email address as '$user'." -ForegroundColor yellow外无其他输出。

内容的提问来源于stack exchange，提问作者PSrookie