如本MS文档中所述，不支持通过API列出Power BI已安装应用的服务主体身份验证。
当我在我的环境中运行你的PowerShell脚本时，我也得到了相同的错误如下：

$AppId = "appId"
$AppSecret = "client_secret"
$tenantID = "tenantId"
$workspaceId = "workspaceId"

$credentials = New-Object System.Management.Automation.PSCredential ($AppId, (convertto-securestring $AppSecret -asplaintext -force))
Connect-PowerBIServiceAccount -ServicePrincipal -Credential $credentials -Tenant $tenantID

# Get the access token from the authenticated session 
$accessToken = Get-PowerBIAccessToken
$accessToken = $accessToken.Values
$headers = @{  
       "Authorization" = "$accessToken"     
       "Content-Type" = "application/json"  
       }

# Create the HTTP request
$ListAppsResponse = Invoke-RestMethod -Uri "https://api.powerbi.com/v1.0/myorg/apps" -Headers $headers -Method Get

# Filter the apps by workspaceId
$appsInWorkspace = $ListAppsResponse.value | Where-Object { $_.workspaceId -eq $workspaceId }

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回复：

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要解决错误，您需要以用户身份连接Power Bi帐户，而不是以服务主体身份连接。
在我的例子中，我通过传递用户的凭据修改了脚本，并以用户身份连接到Power Bi帐户，如下所示：

$username = "[email protected]"
$password = "xxxxxxxxxx"

$credentials = New-Object System.Management.Automation.PSCredential ($username, (convertto-securestring $password -asplaintext -force))
Connect-PowerBIServiceAccount -Credential $credentials

# Get the access token from the authenticated session 
$accessToken = Get-PowerBIAccessToken
$accessToken = $accessToken.Values
$headers = @{  
       "Authorization" = "$accessToken"     
       "Content-Type" = "application/json"  
       }

# Create the HTTP request
$ListAppsResponse = Invoke-RestMethod -Uri "https://api.powerbi.com/v1.0/myorg/apps" -Headers $headers -Method Get

型

回复：

的
当我运行**$ListAppsResponse.value时，我在响应**中成功获得了安装的应用列表，如下所示：

的