Usually, waiver applications are denied because there was a lack of information explaining how your operation would work around the dangers of the operation.
For example, if you’re applying for a Daylight Operations waiver to operate your drone at night and you fail to explain to the FAA how you will maintain sight of the drone at night, the application would likely be denied.
Go into greater detail about your plan of operations and clarify the information. The FAA wants to know exactly what your mission is and if they think you can conduct it under the waiver based on the information provided.
For more information about flying your drone at night, check out: