[EHaskins]

Are you using an older version of the OI or RC?

Are all of the cables to/from the radios connected properly?

Is the team number synchronized between the OI and RC? I doubt this is the case because as soon as you tether the OI and RC their team numbers are synchronized.

Have you tried the radios since you tethered the robot? If you tethered the robot, but haven't tried the radios again it might work now that the team numbers are synced.

Like Dave said we need more info to help you.