Azure CloudBlobContainer.CreateIfNotExists() throws the container already exists error with crashes webpage - azure

Question

I have a asp.net core app that uploads file to azure blob storage. The upload completes successfully but when CloudBlobContainer calls CreateIfNotExistAsync the web page crashes with a "The container already exists error".
var container = BlobClient.GetContainerReference(containerName.ToString().ToLower());
await container.CreateIfNotExistsAsync();
return container;
I have tried using surronding CreateIfNotExistsAsync() with the following if
if (! await container.ExistsAsync())
but that still errors.
The container name and the AccountName= in the connection string is lowercase.
I am using the latest stable Microsoft.Azure.Storage.Blob NuGet package 10.0.2
I have tried to catch the StroageExeception but the exception is not called
try
{
await container.CreateIfNotExistsAsync();
}
catch (StorageException ex)
{
Logger.LogError(ex.ToString());
}
I have been through all the points in this previous question but none of them apply/work in my scenario Azure Blob 400 Bad request on Creation of container
public class CloudBlobStorageProvider : ICloudBlobStorageProvider
{
private CloudBlobClient BlobClient { get; }
private ILogger Logger { get; }
public CloudBlobStorageProvider(IConfiguration configuration, ILogger<CloudBlobStorageProvider> logger)
{
var connectionString = configuration.GetConnectionString("AzureStorageAccount");
if (!CloudStorageAccount.TryParse(connectionString, out CloudStorageAccount storageAccount))
{
logger.LogError($"The supplied connection string for Azure blob storage could not be parsed: {connectionString}");
}
BlobClient = storageAccount.CreateCloudBlobClient();
}
public async Task<CloudBlobContainer> GetContainerAsync(CloudBlobContainerName containerName)
{
var container = BlobClient.GetContainerReference(containerName.ToString().ToLower());
await container.CreateIfNotExistsAsync(BlobContainerPublicAccessType.Off, null, null);
return container;
}
}
public interface ICloudBlobStorageProvider
{
Task<CloudBlobContainer> GetContainerAsync(CloudBlobContainerName containerName);
}
Which is called by
public async Task<CloudBlockBlob> UploadServiceUserAttachmentAsync(IFormFile formFile)
{
var fileExtenion = RegularExpressionHelpers.GetFileExtension(formFile.FileName);
string attachmentFileName = (string.IsNullOrEmpty(fileExtenion)) ? $"{Guid.NewGuid().ToString()}" : $"{Guid.NewGuid().ToString()}{fileExtenion}";
var userAttachmentContainer = await CloudBlobStorageProvider.GetContainerAsync(CloudBlobContainerName.userattachments);
var blobBlockReference = userAttachmentContainer.GetBlockBlobReference(attachmentFileName);
try
{
using (var stream = formFile.OpenReadStream())
{
await blobBlockReference.UploadFromStreamAsync(stream);
await blobBlockReference.FetchAttributesAsync();
var blobProperties = blobBlockReference.Properties;
blobProperties.ContentType = formFile.ContentType;
await blobBlockReference.SetPropertiesAsync();
}
}
catch (Exception e)
{
Logger.LogWarning(e, $"Exception encountered while attempting to write profile photo to blob storage");
}
return blobBlockReference;
}