Based on the error message indicating an authentication failure, I suggest verifying the following options:
Please verify the storage networking properties. If the storage account is restricted, ensure that you whitelist the source virtual network where your application is hosted.
Validate whether you have granted the necessary permissions for the connection string or authentication credentials used to access the storage account.
When you create a storage account, the minimum TLS version defaults to 1.2. hence, I recommend validating that your application is compatible with this TLS version.
Please ensure that you are using the most up-to-date version of the Azure SDK for .NET.
https://video2.skills-academy.com/en-us/dotnet/api/overview/azure/storage?view=azure-dotnet
Please do let me know if you need any further assistance with regards to this question.