Sennheiser Momentum, iPhone 6S, & inline remote
I recently purchased an iPhone 6S, running iOS 10.0.2, for use with my Sennheiser Momentum headphones (which I had already been using with an iPhone 6 and an iPad Air 2, also running iOS 10.0.2). While the headphones work fine, the volume control doesn't work most of the time. Increasing the mystery, Apple headphones as well as other third party headphones (Bose, Phonak) all work fine in the new 6S. A trip to the local Apple Store for tech support also led to the answer "everything works fine". I tried the Sennhesier headphones in a few other iPhone 6S's at the shop, but they still failed to work.
This really has me stumped. Anyone have any idea why this Sennheiser inline remote hates the iPhone 6S?
iPhone 6s, iOS 10.0.2