When running my legacy pipeline on Azure devops I ran into the following issue when running AZCopy.
<pre><code class="language-bash">2020-11-15T12:30:03.1523563Z ##[error]Upload to container: 'css' in storage
account: 'tmdn' with blob prefix: '' failed with error: 'AzCopy.exe exited with
non-zero exit code while uploading files to blob storage.' For more info please
refer to https://aka.ms/azurefilecopyreadme 
</code></pre>
<hr>
After some investigation I discovered that I had to apply the following roles to the service principal at the Storage Account IAM level:
<ul>
<li>Storage Blob Data Contributor</li>
<li>Storage Blob Data Owner</li>
</ul>
Once the above roles were applied the issue was resolved and I was able to copy items into Azure Storage.

Solving the Azure Copy permissions by ensuring that the correct roles are applied to the service principal at the storage account IAM level.

Azure Copy Permissions Error