Unable to Get Entry ID on Form Submission/Form Fields

I am using Post my Contact Form 7 Along with Integration for Contact form 7 HubSpot Plugin.

Like ‘Post my Contact Form 7’ provides us an interface to map form and post fields, Similarly ‘Integration for Contact Form 7 Hubspot’ also provides an interface to map form fields with HubSpot Contact Properties.
In Contact Form 7 Fields, i can see there is an option to select Entry ID, but It is not returning any value. When I send data to Hubspot, it sends a null/Empty value to Hubspot.