我已经在这个问题上卡住了很长一段时间了，没有运气靠自己推进它。
我正在尝试使用MSI令牌从Azure应用服务连接到EF CodeFirst托管数据库。
当我使用ARM部署App Service时，我生成了一个输出，确保它创建了一个Service Principal：

{
  "principalId":"98f2c1f2-0a86-4ff1-92db-d43ec0edxxxx","
  tenantId":"e6d2d4cc-b762-486e-8894-4f5f440dxxxx",
  "type":"SystemAssigned"
 }

字符串
在Kudu中，环境变量显示它正在安装：

MSI_ENDPOINT = http://127.0.0.1:41239/MSI/token/
MSI_SECRET = 7C1B16Fxxxxxxxxxxxxx

型
我在Azure Portal中提供了如下连接字符串：

Data Source=nzmoebase0000bt.database.windows.net;Initial Catalog=nzmoebase0001bt;Connect Timeout=300;MultipleActiveResultSets=False;Encrypt=True;TrustServerCertificate=False;Connection Timeout=300;

型
我已将主体作为所有者添加到数据库中。

Note: I cannot do the same for the master db.

型
该令牌被添加到DbContext中，如下所示：
正在使用以下方式添加令牌：

static async Task AttachAccessTokenToDbConnection(IDbConnection dbConnection)
    {
        SqlConnection sqlConnection = dbConnection as SqlConnection;
        if (sqlConnection == null)
        {
            return;
        }
        string msiEndpoint = Environment.GetEnvironmentVariable("MSI_ENDPOINT");
        if (string.IsNullOrEmpty(msiEndpoint))
        {
            return;
        }
        var msiSecret = Environment.GetEnvironmentVariable("MSI_SECRET");
        if (string.IsNullOrEmpty(msiSecret))
        {
            return;
        }
        // To get around:
        // "Cannot set the AccessToken property if 'UserID', 'UID', 'Password', or 'PWD' has been specified in connection string."
        var terms = new[] {"UserID","Password","PWD=","UID=" };
        string connectionString = dbConnection.ConnectionString;
        foreach (var term in terms)
        {
            if (connectionString.Contains(term, StringComparison.InvariantCultureIgnoreCase))
            {
                return;
            }
        }
        string accessToken = await AppCoreDbContextMSITokenFactory.GetAzureSqlResourceTokenAsync();
        sqlConnection.AccessToken = accessToken;
    }

型
在启用跟踪的情况下，令牌为：

.eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI....

型
使用jwt.io解码得到：

{
  "typ": "JWT",
  "alg": "RS256",
  "x5t": "FSimuFrFNoC0sJXGmv13nNZceDc",
  "kid": "FSimuFrFNoC0sJXGmv13nNZceDc"
}.{
  "aud": "https://database.windows.net/",
  "iss": "https://sts.windows.net/e6d2d4cc-b762-486e-8894-4f5f440dxxxx/",
  "iat": 1522783025,
  "nbf": 1522783025,
  "exp": 1522786925,
  "aio": "Y2NgYPjNdyJd9zrzpLavJSEzNIuPAAA=",
  "appid": "d1057cea-461b-4946-89a9-d76439c2xxxx",
  "appidacr": "2",
  "e_exp": 262800,
  "idp": "https://sts.windows.net/e6d2d4cc-b762-486e-8894-4f5f440dxxxx/",
  "oid": "98f2c1f2-0a86-4ff1-92db-d43ec0edxxxx",
  "sub": "98f2c1f2-0a86-4ff1-92db-d43ec0edxxxx",
  "tid": "e6d2d4cc-b762-486e-8894-4f5f440dxxxx",
  "uti": "59bqKWiSL0Gf0bTCI0AAAA",
  "ver": "1.0"
}.[Signature]

型
我添加了Persist Security Info = True根据网上的几个建议，但没有什么可检测的.

Data Source=nzmoebase0000bt.database.windows.net;Initial Catalog=nzmoebase0001bt;MultipleActiveResultSets=False;Persist Security Info = True;Encrypt=True;TrustServerCertificate=False;Connection Timeout=30;

型
我得到的错误是：

[InvalidOperationException: This operation requires a connection to the 'master' database. Unable to create a connection to the 'master' database because the original database connection has been opened and credentials have been removed from the connection string. Supply an unopened connection.]

型
有没有人使用CodeFirst、Migrations和MSI连接到数据库？在这一点上，经过几个星期的真正卡住，我开始怀疑这是否可能。
谢谢你的任何帮助--即使只是证明它可以工作，首先。