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Why can't dota2 make a call by pressing the call button? It displays a picture on the microphone. ...

There are two reasons. One is that the earphone is not plugged in properly. Check whether the earphone is plugged into the jack and make sure it is plugged tightly. If there is no sound when the earphone is plugged into the earphone jack in front of the computer, please check whether the front audio cable of the chassis is correctly plugged into the motherboard or the audio cable jack behind the computer.

Entering dota2, I found a "gear" on the upper left, which is the setting function. Click Settings to enter the detailed interface and find "Audio".

This is because the microphone set in your computer is not turned on or the microphone is broken. In Internet cafes, some computers can and some can't.

If it is a USB jack, it may be that your driver is not installed ... and check whether the microphone is turned off.