Audio issues during music lesson

Hello, im having online guitar lessons and when i use zoom from my mobile phone it works fine, but when i try from my laptop my guitar is muted. After some research i found out what the correct audio settings are, but it still doesnt work. I have unclicked the "auto adjust mic volume" button and clicked the "enable original sound for musicians" button. Then when in a meeting i click original sound for musicians on, on the top of the screen. Still my guitar is muted. Can anyone help me? Even the teacher doesnt have a clue. How do i fix this?