I am trying to upload a simple blob from an azure function app with managed identity:

public class BlobUtil
{
    static public async Task UploadBlob(string accountName, string containerName, string blobName, string blobContents)
    {
        // Construct the blob container endpoint from the arguments.
        string containerEndpoint = string.Format("https://{0}.blob.core.windows.net/{1}",
                                                    accountName,
                                                    containerName);

        // Get a credential and create a client object for the blob container.
        BlobContainerClient containerClient = new BlobContainerClient(new Uri(containerEndpoint),
                                                                        new DefaultAzureCredential());

        try
        {
            // Create the container if it does not exist.
            await containerClient.CreateIfNotExistsAsync();

            // Upload text to a new block blob.
            byte[] byteArray = Encoding.ASCII.GetBytes(blobContents);

            using (MemoryStream stream = new MemoryStream(byteArray))
            {
                await containerClient.UploadBlobAsync(blobName, stream);
            }
        }
        catch (Exception e)
        {
            throw e;
        }
    }
}

await BlobUtil.UploadBlob("stintxxxxatadev", "xxx", Guid.NewGuid().ToString()+".json", "yo bro");

I get following error:

The I/O operation has been aborted because of either a thread exit or
an application request

And

Status: 403 (This request is not authorized to perform this
operation.)

The function has been provided following access on the storage account:

Am I missing some further access settings or any ideas on how to troubleshoot this?