Azure Functions and Managed Identity Failing to Access Key Vault with 'Access Denied' Error
I'm updating my dependencies and I'm not sure how to approach I'm following best practices but I'm trying to debug After trying multiple solutions online, I still can't figure this out... After trying multiple solutions online, I still can't figure this out. I'm using Azure Functions v3 with a managed identity to access Azure Key Vault, but I'm encountering an 'Access Denied' error when trying to retrieve secrets. I've enabled the Managed Identity in the Azure portal and assigned it the 'Get' permission for secrets in the Key Vault's access policies. Here’s a snippet of the code I’m using to access the Key Vault: ```csharp using Microsoft.Azure.Services.AppAuthentication; using Microsoft.Azure.KeyVault; public static async Task<string> GetSecretAsync(string secretName) { var azureServiceTokenProvider = new AzureServiceTokenProvider(); var kv = new KeyVaultClient(new KeyVaultClient.AuthenticationCallback(azureServiceTokenProvider.KeyVaultTokenCallback)); var secret = await kv.GetSecretAsync("https://<your-key-vault-name>.vault.azure.net/secrets/" + secretName); return secret.Value; } ``` I verified that the Key Vault URI is correct and that the function app has the appropriate permissions. However, when I run this code, I get the following error: ``` Microsoft.Azure.Services.AppAuthentication.AzureServiceTokenProviderException: Failed to retrieve the access token. Access denied. ``` I also ensured that the Key Vault’s firewall allows access from my Azure Function’s outbound IP addresses. I've double-checked that the managed identity is enabled and that the Key Vault policy includes the identity with proper permissions. Is there something I'm missing or misconfigured? What could be the cause of this issue? My development environment is Linux. What's the best practice here? My development environment is Ubuntu. I'd really appreciate any guidance on this. I'm open to any suggestions. I'm coming from a different tech stack and learning Csharp. Thanks for any help you can provide! I'm working with Csharp in a Docker container on CentOS. Thanks for taking the time to read this! This is part of a larger REST API I'm building. I'd really appreciate any guidance on this.