We reached out to Motorola customer support to see if this was a hardware limitation, software limitation that could be fixed via an upcoming OTA, or if the vendors of these devices needed to update their applications to get everything working. According to our support conversation, Motorola is aware of the issue, and it’s definitely on their radar. Others seem to have similar results over on the official Motorola forums.
It looks like future support for TRS (tip, ring, and sleeve) plug devices is coming in a future software update. If you were looking to purchase one of these Motorola phones, is this a deal breaker for you or are you hopeful for a timely software update in the future? Me, I’m just going to tether to my Nexus 7 (2013) for the time being.