During agent installation the client device is presented with a prompt for credentials as seen below:
The prompt is due to Location Reporting being enabled within the Agent's Inventory Settings. With the release of EPM 2017.3 location reporting can be used on all laptops/tablets, hardware permitting. This requires opt-in on both the Console as well as an opt-in of at least one enrolled user on the client devices themselves in order for GPS coordinates to be sent to the core. The prompt is displayed to fulfill the opt-in requirement on the client side.
Location Information can be found within the device's inventory record under Mobile Broadband > GPS Location.