The message "No Subscriptions Available" is a message letting you know, that there are no subscriptions available for use in FLEET. Subscriptions are required in order to enroll generator in FLEET. The subscriptions are dependent on what type of device you are enrolling. (WIFI, LTE, INDUSTRIAL) In order to be able to enroll generators in FLEET, additional subscriptions will need to be purchased. You can Purchase additional subscriptions through GenService.
To learn more on how to purchase additional subscriptions for FLEET, please reference the relevant article here.