Shield and IPad won't schedule Recordings

I just got my new nVidia Shield. It is by the far the best Plex player yet! It also supports Live TV and DVR which I was excited about. I am NOT using the Shield as a Plex Server, that is done by a Windows Server.

Live TV works fine. The Program Guide and Recording Schedule display correctly.

The problem is that when I try to schedule a Recording on the Shield, nothing happens and no error message,. So I tried the iPad to schedule (for the first time) and got this error:

“Uh oh! A problem occurred Response error Code: 400”

The same problem happened on the iPhone.

Up until I got the Shield I scheduled all recordings via Plex Web Browser which has worked with no issues and continues to do so.

Server: Windows 10, Intel Xeon E3-1265L 16GB RAM, huge amount of disk space