How to configure Azure Functions with managed identity for Azure SQL Database access?
I'm performance testing and I'm trying to set up an Azure Function that connects to an Azure SQL Database using a managed identity, but I'm running into issues with authentication. I've followed the documentation, but I'm still getting an behavior. I've created a system-assigned managed identity for my Azure Function and granted it the `Contributor` role on the SQL Database. I also added the managed identity to the SQL Database as a user with `db_datareader` and `db_datawriter` roles. My connection string looks like this: ```json { "Server": "myserver.database.windows.net", "Database": "mydatabase", "Authentication": "ActiveDirectoryManagedIdentity" } ``` In my function code, I'm trying to connect like this: ```csharp using System.Data.SqlClient; using Microsoft.Azure.Services.AppAuthentication; public static async Task<IActionResult> Run(HttpRequest req, ILogger log) { var connectionString = "Server=myserver.database.windows.net; Database=mydatabase; Authentication=ActiveDirectoryManagedIdentity;"; using (var sqlConnection = new SqlConnection(connectionString)) { await sqlConnection.OpenAsync(); // Execute some SQL commands... } } ``` When I run the function, I receive the following behavior: ``` System.Data.SqlClient.SqlException: want to connect to the database because the access token could not be retrieved. ``` I've verified that my Azure Function has the appropriate permissions and that the identity is enabled. I've also tried adding the `AzureServiceTokenProvider` to explicitly fetch the token like this: ```csharp var azureServiceTokenProvider = new AzureServiceTokenProvider(); var token = await azureServiceTokenProvider.GetAccessTokenAsync("https://database.windows.net/"); ``` But I'm still getting the same behavior. Am I missing something in the configuration? Any guidance on how to properly set this up would be greatly appreciated! I'm on macOS using the latest version of Csharp. I'd be grateful for any help.