The problem encountered by the subject should be due to the improper adjustment of earphone/speaker volume and microphone volume.
one of the methods is system adjustment. first, right-click the speaker icon at the lower right of the desktop.
Left-click again to select "Recording Device"
Select a microphone in the pop-up interface and adjust the volume.
Another way is to adjust the game interface. Different games are basically the same, setting → audio → microphone.