Nikon D500 next firmware is expected to arrive soon, the upcoming firmware will fix the snapbridge connectivity issue of the Nikon D500 camera. Recently, Nikon announced the snapbridge related firmware update for Nikon D5600 and Nikon D3400 cameras.
According to Nikon there are some connectivity issue between snapbridge app and iOS version 10 + and for that they will be soon announcing a new fix /update on March 2017.
Also look – Nikon D500 Best Lenses