Same issue when I upgraded to the new roku express 3700. Just "iPhone", even though I manually added the ip addy as instructed. I went back to my older Roku 2 and bang, the roku SN showed up and works fine and had no problem slinging. Don't know if it's the Roku software or something else with the Express. Roku Express software is 7.2.2; Roku 2 software is 7.2.0 + build 4113-06. Roku says to contact the channel developer when this type of issue arises. That would be Sling Media. Working on doing that now.