Games and microphone reccording problem

Hello , i hope you are fine .

can you help me please ? when i'm reccording while playing my games on my PC the sound of my voice aren't saved in the video .... it's like i'm not talking at all ! But every other sounds made by the PC are in the video ...

I tried to reccord the clip when i'm not playing any games , like i reccorded a video filming the WIN10 desktop and my voice got saved in the clip but when i launch the game without touching the settings , it doesnt work !

i tried with steam games , GOG games , EPIC games and i can catch the video clip of my games but i cannot reccord my voice in them while i'm playing

would you please help me find a solution ?

Thank you for reading my post , by the way i'm not a native english speaker so here's my apologize for the mistakes i've made in those sentences

:)