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Do you want blobContainers to be an object with 3 properties? Or an array with 3 items? I think the problem here is just your YAML.

This may be what you want:
```&lt;stack_name&gt;:blobContainers:
- name: container_name1
  accessLevel: Container
- name: container_name2
  accessLevel: Blob
- name: container_name3
  accessLevel: Container```