hashicorp/terraform · error

unable to build authorizer for Storage API: %+v

Error message

unable to build authorizer for Storage API: %+v

What it means

Returned by buildClient when use_azuread_authentication=true and auth.NewAuthorizerFromCredentials fails to build an authorizer for the Storage (data-plane) API. The %+v wraps the underlying auth error, which usually describes missing/invalid credentials or an unsupported auth configuration.

Source

Thrown at internal/backend/remote-state/azure/api_client.go:64

		environment:        config.AuthConfig.Environment,
		storageAccountName: config.StorageAccountName,
	}

	var armAuthRequired bool
	switch {
	case config.AccessKey != "":
		client.accessKey = config.AccessKey
	case config.SasToken != "":
		sasToken := config.SasToken
		if strings.TrimSpace(sasToken) == "" {
			return nil, fmt.Errorf("sasToken cannot be empty")
		}
		client.sasToken = strings.TrimPrefix(sasToken, "?")
	case config.UseAzureADAuthentication:
		var err error
		client.azureAdStorageAuth, err = auth.NewAuthorizerFromCredentials(ctx, *config.AuthConfig, config.AuthConfig.Environment.Storage)
		if err != nil {
			return nil, fmt.Errorf("unable to build authorizer for Storage API: %+v", err)
		}
	default:
		// AAD authentication (ARM scope) is required only when no auth method is specified, which falls back to listing the access key via ARM API.
		armAuthRequired = true
	}

	// If `config.LookupBlobEndpoint` is true, we need to authenticate with ARM to lookup the blob endpoint
	if config.LookupBlobEndpoint {
		armAuthRequired = true
	}

	if armAuthRequired {
		resourceManagerAuth, err := auth.NewAuthorizerFromCredentials(ctx, *config.AuthConfig, config.AuthConfig.Environment.ResourceManager)
		if err != nil {
			return nil, fmt.Errorf("unable to build authorizer for Resource Manager API: %+v", err)
		}

		// When using Azure CLI to auth, the user can leave the "subscription_id" unspecified. In this case the subscription id is inferred from

View on GitHub (pinned to c9def3e214)

Solutions

1. Verify all required Azure AD credential env vars (ARM_CLIENT_ID, ARM_CLIENT_SECRET or ARM_USE_MSI, ARM_TENANT_ID) are set and valid.
2. Ensure the service principal / managed identity has 'Storage Blob Data Contributor' or equivalent data-plane role on the storage account.
3. Check the environment/endpoint config and network access to Azure AD and Storage endpoints.

// Verify required AAD credential env vars before init when using Azure AD storage auth.
for _, k := range []string{"ARM_CLIENT_ID", "ARM_TENANT_ID"} {
    if os.Getenv(k) == "" { return fmt.Errorf("%s required for Azure AD storage auth", k) }
}

client, err := buildClient(ctx, config)
if err != nil && strings.Contains(err.Error(), "build authorizer for Storage API") {
    // guide user to AAD credential / RBAC issues
}

When it happens

Trigger: Configuring the azurerm backend with use_azuread_authentication = true, and the AuthConfig credentials (client id/secret, tenant, etc., or CLI/managed identity) cannot produce a Storage-scope token. Fails during terraform init/Configure.

Common situations: Missing ARM_CLIENT_ID/ARM_CLIENT_SECRET/ARM_TENANT_ID env vars; client secret expired; the service principal lacks Storage data-plane permissions; misconfigured environment metadata; using MSI in an environment where the metadata endpoint is unreachable.

Related errors

• unable to build authorizer for Resource Manager API: %+v
• sasToken cannot be empty
• subscription id not specified
• new shared key authorizer: %v
• building Storage Accounts client: %+v

AI-assisted analysis of hashicorp/terraform@c9def3e214 (2026-08-07). Data as JSON: /api/errors/4dafaafc28c61651. Report an issue: GitHub.