I created some releases and expected them to be applied to the devices that I had commissioned earlier. However, the releases all had “Devices 0” and no indication of what went wrong. When I was looking around in the host OS I accidentally found the output of “date” to be 2 weeks behind, so I figured that would cause HTTPS issues. After changing the date manually (date 08062018) the device started downloading the release right away.
So I was sharing this topic as a help to anyone experiencing the same, and for Resin to figure out of something in 2.13.6 is stopping the Raspberry Pi from doing a NTP sync on startup.