title: AzureFileCopy with Azure DevOps pipeline fails - 'AzCopy.exe exited with non-zero exit
body: <p>I try to copy ARM templates to storage but failing. 
  What could wrong with YML?</p>
  
  <p>ERROR:</p>
  
  <pre><code>&amp; "AzCopy\AzCopy.exe" logout
  INFO: Logout succeeded.
  INFO: AzCopy.exe: A newer version 10.4.3 is available to download
  
  Disconnect-AzAccount -Scope Process -ErrorAction Stop
  Clear-AzContext -Scope Process -ErrorAction Stop
  ##[error]Upload to container: 'arm' in storage account: 'devopsstorageken' with blob prefix: 'test' 
  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
  Finishing: AzureFileCopy
  </code></pre>
  
  <p>YML:</p>
  
  <pre><code>- task: AzureFileCopy@4
    inputs:
      SourcePath: '$(Build.Repository.LocalPath)/ARMTemplates/CreateSQLServerARM'
      azureSubscription: 'TestRG-Conn'
      Destination: 'AzureBlob'
      storage: 'devopsstorageken'
      blobPrefix: 'test'
      ContainerName: 'arm'
  </code></pre>