Did you set the team number in its preferences? I assume you followed this:
https://wpilib.screenstepslive.com/s...smartdashboard. For us I opened the C++ dashboard.
Also, there is a utility called "outline viewer". It lets you see if the program in the roboRio is sending any data. Its located at "C:\Users\<username>\wpilib\tools\OutlineViewer.ja r"
where <username> is whatever you you installed it under. For me on windows, just clicking on the jar file ran it. Enter the roboRio host name like roborio-TEAM-FRC.local in the host box and click "Start Client".