title: 'AzureBlobDatastore' object is not subscriptable
body: <p>I'm trying to create an azure ml pipeline with python steps and I encounter the following issue: &quot;'AzureBlobDatastore' object is not subscriptable&quot; and I run it using a notebook and all cells are running well beside the last one which is fairly a standard one:</p>
  <pre><code>from azureml.pipeline.core import Pipeline
  from azureml.core import Experiment
  
  # create the pipeline
  pipeline = Pipeline(ws, steps=[data_prep_step, train_step])
  
  # create the experiment and submit and pipeline run
  run1 = Experiment(workspace=ws, name=&quot;Skylabs-first-model&quot;).submit(pipeline)
  </code></pre>