Access to Duplicate contracts for service user for REST API integration

Summary:

We are trying to setup a user with access to duplicate contracts. This user will used for a REST API integration. We've added the Customer Contract Admin role, but the duplicate button always appears unavailable and the duplicate action is also not available in the drop down list when accessing from UI.

What privilege or access rights are necessary for a user to duplicate a contract?

Content (please ensure you mask any confidential information):

This is meant to be a service user with access to duplicate, update, amend and delete contracts via REST APIs, thus it will not be an employee in Manage Resources. For the time being, we have not added this user in Manage Resources.