Server Version#: 1.25.2.5319
Player Version#:8.26.2.29389 (fdca424e)
I have an Android device (Android 7.1.2) with Plex installed. I have activated the Plex app in Android, this works well on my other Android devices and even used to work on this one.
What version of play store and play services is on that device? It is a projector running the mobile app or your phone connected to a projector? What happens if you change the app layout to TV