无法使用图形API发送邮件

Question

无法使用Microsoft-Graph-API (Azure AD B2c)发送邮件。

我尝试过跟随代码，但没有成功。

            IConfidentialClientApplication confidentialClientApplication = ConfidentialClientApplicationBuilder
            .Create(appId)
            .WithTenantId(tenantId)
            .WithClientSecret(clientSecret)
            .Build();

            ClientCredentialProvider authProvider = new ClientCredentialProvider(confidentialClientApplication);

            GraphServiceClient graphClient = new GraphServiceClient(authProvider);

            Message message = new Message
            {
                Subject = "Subject of mail",
                Body = new ItemBody
                {
                    ContentType = BodyType.Text,
                    Content = "Mail content",
                },
                ToRecipients = new List<Recipient> 
                { 
                    new Recipient 
                    {
                        EmailAddress = new EmailAddress
                        {
                            Address = email,
                        }
                    }
                },
            };

            await graphClient.Me.SendMail(message).Request().PostAsync();

它会给出以下错误：

Code: OrganizationFromTenantGuidNotFound
Message: The tenant for tenant guid 'xxxxxx' does not exist.
Inner error:
    AdditionalData:
    requestId: 0ecdb3f9-a210-4259-bd62-0c79e757d1f6
    date: 2020-08-05T02:17:07
    request-id: 0ecdb3f9-a210-4259-bd62-0c79e757d1f6
ClientRequestId: 0ecdb3f9-a210-4259-bd62-0c79e757d1f6

注意:还提供了对Mail.Send的权限

Answer 1

这是因为你的Azure AD B2C租户在O365订阅下没有Exchange online许可证。

因此，B2C用户没有邮箱来发送电子邮件，尽管它的UPN看起来像一个电子邮件地址。

如果可能，请尝试向租户分配O365订阅，并向B2C用户添加Exchange online许可证。