After spending some time, I realize that I need to make an association of newly created Business Process Flow to the Customer Service App.

  • Go to Dynamics 365 Organization Customization (Settings – Customizations – Customize the System).
  • Select Apps and double click ‘Customer Service’.

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  • Select Business Process Flows on the design panel

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  • Ensure that your newly created Business Process Flow is marked as selected.
  • Click Save and then Publish.

Viola!!