Final answer:
In a Microsoft Dynamics 365 environment for Field Service, configuring the Microsoft Dynamics 365 mobile app is required to enable mobile device interaction for users.
Step-by-step explanation:
To ensure that users can interact with Field Service on a mobile device in a Microsoft Dynamics 365 environment, one should configure the Microsoft Dynamics 365 mobile app. Unlike the other options listed, the Dynamics 365 mobile app is designed to provide a seamless mobile experience for the users to access Microsoft Dynamics 365 solutions, including Field Service functionality. The app is available for download on various mobile platforms and once configured, can provide users with the ability to manage service activities, equipment, and customer data on the go.