OBS is not recognizing a particular input channel from soundboard

DOCK1R3Y

New Member
Disclaimer: I am a novice when it comes to OBS. With that said, we have a PC connected to a Yamaha TF3 to play music, etc. through our speakers. The TF3, then, is connected to a MacBook, which we use to live stream our church services. Everything has worked great...until this week. We have our Christmas cantata this Sunday, and I tried to record our choir during their last practice (to test their sound levels) only to find that OBS is not recognizing the music from the computer that is going through the board. The sound is great within the building, and everything looks good on the TF3, but OBS is showing zero sound input from that channel, which receives input from our PC. I checked the sample rate going out of the PC and it is 48 kHz. Is there anything that I am missing?

Update: I tried to play the music for the cantata on
 
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