I’m currently working on with Graph SDK v5 (.NET).
I’m trying to get all the drive ID using the sites list.
I other reference show the way to call API for each time using each requestID, but I want to get all the batch response at a onetime. Bellow is a code I’m working, having error with GetResponseAsync()

private List<(string SiteId, string DriveId)> GetSharepointDriveIds(GraphServiceClient gsc, List<Site> siteList)
{
    var siteDriveIds = new List<(string SiteId, string DriveId)>();
    int batchSize = 20;

    for (int i = 0; i < siteList.Count; i += batchSize)
    {
        var batchRequestContent = new BatchRequestContentCollection(gsc);
        var batchSites = siteList.Skip(i).Take(batchSize).ToList();

        foreach (var site in batchSites)
        {
            var requestInformation = gsc.Sites[site.Id].Drives.ToGetRequestInformation();

            var requestId = batchRequestContent.AddBatchRequestStepAsync(requestInformation).GetAwaiter().GetResult();
        }
        // I'm having error here
        var batchResponseContent = gsc.Batch.PostAsync(batchRequestContent).GetAwaiter().GetResult();

        var responses = batchResponseContent.GetResponsesAsync().GetAwaiter().GetResult();
    }

    return siteDriveIds;
}

please suggest!!