Google cloud - Deployment manager: creating External table using hive partitioning

Question

I'm trying to create an external table with partitioning on Hive using the Deployment manager (.yaml). My code is like this, but it is not returning the key.

resources:       
  - name: test
    type: bigquery.v2.table
    properties:
      storageClass: STANDARD
      location: us-east1
      datasetId: testingdataset #id do dataset
      tableReference:
        projectId: project #id do projeto
        tableId: testing
        description: Table test
      schema:
        fields:
        - mode: nullable 
          name: Test1
          type: STRING

        - mode: nullable 
          name: Test2
          type: STRING

        - mode: nullable
          name: Test3
          type: STRING

      externalDataConfiguration:         
        hivePartitioningOptions:
          mode: CUSTOM
          sourceUriPrefix: gs://testing-bucket/{dt:STRING}
          fields: dt
        sourceUris: 
            - gs://testing-bucket/dt=*/testing.csv
        sourceFormat: CSV
        csvOptions: 
          fieldDelimiter: ;