Azure Event Grid用内置角色权限替代SAS Key认证失败求助

我有一个部署在Azure上的WebApp，原本使用SAS Key向同订阅下的Azure Event Grid Topic发送消息。现在需要取消SAS Key的使用，改用内置角色与权限，且确保该WebApp是该Event Grid Topic的唯一消息来源。

我尝试了两种代码方案，但均无法正常工作：

方案1 #

Uri endpoint = new Uri(topicEndpoint);
EventGridPublisherClient client = new EventGridPublisherClient(endpoint, new DefaultAzureCredential());
gridEvent = new EventGridEvent(
    subject: eventType,
    eventType: eventType,
    dataVersion: "1.0",
    data: new
    {
        Property1 = "Property1Value",
        Property2 = "Property12Value"
    }
);

var result = client.SendEventAsync(gridEvent);
returnResponse = result.Result.ToString();

方案2 #

Uri endpoint = new Uri(topicEndpoint);
EventGridPublisherClient client = new EventGridPublisherClient(endpoint, new DefaultAzureCredential(
    new DefaultAzureCredentialOptions()
    {
        ManagedIdentityClientId = clientId
    }
));
gridEvent = new EventGridEvent(
    subject: eventType,
    eventType: eventType,
    dataVersion: "1.0",
    data: new
    {
        Property1 = "Property1Value",
        Property2 = "Property12Value"
    }
);

var result = client.SendEventAsync(gridEvent);
returnResponse = result.Result.ToString();

//注：clientId为对应截图中的应用ID

我持续收到错误：

GraphQL error: 发生一个或多个错误。(发生一个或多个错误。(DefaultAzureCredential 无法从包含的凭据中检索令牌。- EnvironmentCredential 身份验证不可用。环境变量未完全配置。- WorkloadIdentityCredential 身份验证不可用。工作负载选项未完全配置。- ManagedIdentityCredential 身份验证不可用。多次尝试从托管身份端点获取令牌均失败。- 无法访问Visual Studio令牌提供程序，路径为D:\DWASFiles\Sites\sbx-job-web-int\LocalAppData.IdentityService\AzureServiceAuth\tokenprovider.json - 未安装Azure CLI - 未安装Az.Account模块 >= 2.2.0 - 找不到Azure Developer CLI。))

补充WebApp相关配置截图后，两种方案仍无法向Topic发送消息，请问我是否遗漏了什么配置？

内容的提问来源于stack exchange，提问作者Xander Kage