wav file generated through direct microphone of laptop Not recognized but works with headphones

I'm using this for a windows voice assistant desktop app. it works fine as is with bluetooth headphones. but not working if we talk directly to laptop microphone. we can see wav file is saved and valid, when we play it, we can validate it is same as what we spoke, we can see uint8list byte array is printing when read but recognized only if spoke through bluetooth headphones but not recognized when spoke through direct microphone of laptop. please help