ADAL v5.2.9 PowerShell调用AcquireTokenAsync提示方法不存在求助

1. 变量名拼写错误修正 #

代码中定义的认证上下文变量为$authenticationContext，但报错行调用时使用了未定义的$authContext，变量名不匹配是报错的直接原因，先统一变量名。

2. ADAL v5版本接口适配 #

ADAL v5.2.9对异步方法重载做了调整，原AcquireTokenAsync针对客户端证书凭证的重载已拆分，替换为专用的AcquireTokenForClientAsync方法即可，同时增加异步等待逻辑避免偶发空值。

3. 修正后完整代码 #

function Get-AccessToken
{
    $tenantID = "<id>" 
    $AuthUri = "https://login.microsoftonline.com/$tenantID"    
    # SPN配置
    $AppId = ""
    # 证书配置
    $clientCertificate = Get-Item -Path Cert:\CurrentUser\My\<cert thumb>
    $resource = "<RestApi>"
    $adal = "<path to the dll>\Microsoft.IdentityModel.Clients.ActiveDirectory.dll"
    [System.Reflection.Assembly]::LoadFrom($adal) | Out-Null
    $authenticationContext = New-Object -TypeName Microsoft.IdentityModel.Clients.ActiveDirectory.AuthenticationContext -ArgumentList $AuthUri
    $certificateCredential = New-Object -TypeName Microsoft.IdentityModel.Clients.ActiveDirectory.ClientAssertionCertificate -ArgumentList ($AppId, $clientCertificate)
    # 替换适配v5版本的方法，添加异步等待
    $authToken = $authenticationContext.AcquireTokenForClientAsync($resource, $certificateCredential)
    $authToken.Wait()
    $accessToken = $authToken.Result.AccessToken.Trim()
    $accessToken | Clip
    Write-Host "Token length"
    Write-Host $accessToken.Length
    $accessToken
}
# 获取访问令牌
$token = Get-AccessToken

可选兼容方案 #

如果要保留原AcquireTokenAsync写法，补充第三个参数$null适配v5版本的重载要求即可：

$authToken = $authenticationContext.AcquireTokenAsync($resource, $certificateCredential, $null)

内容的提问来源于stack exchange，提问作者munna