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If these settings are not set correctly, you might be experiencing several issues.
Incorrect in-game settings: CS: GO has its in-game settings present inside the game which control the input of the microphone and the threshold volume etc. Here, reinstalling the drivers will help. Bad drivers: It is possible that the drivers installed on your computer against your Microphone device are either outdated or corrupt. Here, you have to manually navigate to the settings and grant permission. Restriction in Settings: After a Windows Update, all the applications which were initially granted access to the microphone had their permissions removed.