Users see an empty list when they are not authorized to allocate devices, or when the allocatable devices are currently allocated by another user or are in an error state. If a user cannot see a device in the Available Devices list, the user needs to contact the responsible administrator.
If the user is not authorized but should be, the Security Administrator role can add the Allocate Device authorization to one of the user's profiles.
If the device is not listed because it is already allocated or it is in an allocate error state, the administrator can force deallocation of a device or reclaim it from the error state.