LINE INPUT DOES NOT RECOGNIZE MICROPHONE, ONLY NORMAL AUDIO.

I work on a radio and the sound input is through the microphone connector and the output is through the output connector, and I put the input into the line input connector, configured it and the audio came in normally, but the voice doesn't come out, just the music comes out. I had to put the sound input into the line input because the microphone connector has bad contact. I wanted to know if I will have to use the microphone input again for the voice to come out along with the music, because as I said, the voice doesn't come out through the line input. Thanks to anyone who helps me.