Generally, it takes a few seconds for the syncing process to be completed, so please be patient while the InPlay app attempts to sync with TV audio. If after 30-40 seconds your device still has not synced, please check that you are watching the correct channel and the volume is turned up to a reasonable level.
You may want to place your mobile device's mic near the TV speaker. The game needs to sync with audio from TV with cable or satellite. Tuning in with internet streams will not work, or will not work as well as TV.
Be aware that in order to sync with the live game, you must be watching a national televised game on either ABC, ESPN, TNT OR NBATV. Local networks are not supported at the moment.