remote won't connect

[puglife1227]

I have 2 phantom 3 standard drones, one of my remotes will connect to both drones, but I can't get the other to link to either drone. I push the link button till it's flashing red and pull the gimbal knob to the left and toggle the s2 until it starts beeping, but the red light on remote stays red and it keeps beeping forever lol. the firmware on both drones has been updated to the latest version. I can link it through the dji go app because my phone won't fond the Wi-Fi until the remote is linked. any advise on what else I should try.