Sql server GCP SQL Server应用程序引擎连接：基于令牌的服务器访问验证失败，出现基础结构错误

当我尝试通过App Engine连接我的Google Cloud sql实例时，我遇到以下sql server错误

Login failed for user '\9b73cfe90ee8d1d$'. Reason: Token-based server access validation failed with an infrastructure error. Login lacks connect endpoint permission.

我已将应用程序引擎用户作为管理员添加到SQL项目中，但这并不能解决问题

通过云代理进行本地连接是可行的，但是使用相同的连接字符串

在尝试连接时，Dotnet给了我以下异常：

A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: TCP Provider, error: 40 - Could not open a connection to SQL Server

我的应用程序Yaml

runtime: aspnetcore
env: flex
service: platform
manual_scaling:
  instances: 1
resources:
  cpu: 2
  memory_gb: 1.5
  disk_size_gb: 10
beta_settings:
  cloud_sql_instances: shared-resources-291914:europe-west2:sqlserver-edutec

连接字符串：

"ConnectionStrings": {
    "default": "Server=127.0.0.1;Database=cliche;User Id=sqlserver;Password=password;"
  },

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这是谷歌云方面的一个已知限制

谷歌云Sql工程团队正在努力解决这个问题

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