Corsair HS50 microphone attached to headset not working properly

I think you need to do some more troubleshooting before you can determine what the issue is. Try the following:

1. First, plug the new Corsair headset into a smartphone. Every mainstream smartphone should be compatible with 4 pin jacks (actually not sure how apple tech works these days). Call a friend, can they hear you? can you hear them? try muting the headset mic and determine whether the headset is working correctly.
2. Next, buy or loan a cheap pair of earphones that have a mic (and thus a 4 pin jack). Plug them into your computer and do a test on discord or a program where you can monitor the inputs. Do the earphones work correctly? Does the mic work?
3. If in step one, the headset mic appears not to work in the phone, try the earphones in step 2 in the smartphone and ensure that they work.
4. Try removing the microphone from the headset and plugging it directly into the PC. Test it with a program of your choice - does your PC receive input from the mic now? If so, there could be a connection issue in the headset.

The above steps should help you determine whether the PC is at fault, or if the headset is at fault.

If the earphones are working successfully in the PC, and the headset doesn't work in the phone then the headset may have a fault. Check the manual: does it need additional power / batteries to function? Does it need a particular software or driver installed? Is there a setup issue? If nothing appears to stand out, then contact the manufacturer for advice.

If the earphone mic is not working in the PC and the headset works in the phone, then it could be an issue with the audio input jack on the PC. Use a bright light to examine the hole - is there any visible corrosion, water, or foreign objects? Research your PC model to ensure that there isn't an audio driver required for the microphone to function. Maybe the jack cannot simultaneously operate as an input and output?

This link has some helpful information on this issue: https://community.acer.com/en/discussion/549334/how-can-i-fix-the-realtek-microphone-issue-in-windows-10-aspire-v3-772g - see below (copy and pasted)

Go to Control panel, Click Hardware and Sound. Under Sound click Manage Audio Devices. Click the Recording tab. Check if you can recognize which one of the devices in the list is your microphone. Click on the relevant device to highlight it, The list of recording devices will appear. Try speaking into your microphone, and look for green bars rising while you talk. Double-click on the device from the list. The Microphone Properties window will appear. Click the Levelstab. Drag the slider all the way to the right, until the number ’100′ is displayed beside it.

If still microphone is not working, follow these steps to use the Troubleshooting tool: In Windows, search for and open Troubleshooting. Under Hardware and Sound, click Troubleshoot audio recording, then click Next when the Recording Audio window opens. Click Next in the Recording Audio window. Select the device you would like to troubleshoot, click Next, then follow the on-screen instructions. If a recommended action displays, select Apply this fix or Skip this step to continue to search for other problems. If issue persists try the below mentioned steps : Re-enable the microphone in privacy settings to allow apps to use the microphone, it is not muted. Disable Audio Enhancements , Recording devices > Enhancements tab > Disable all sound effects Reset Windows Audio service, Go to Search, type services.msc, and open Services. Find the Windows Audio service.If this service is not enabled, right-click it, and select Start. If it’s enabled, right-click it and select Restart.

If the issue still persists, you can try reinstalling the audio driver Download Let us know if you need further assistance.

If the earphone mic doesn't work in the pc, but the headset doesn't work in the phone, then it could be a 2 part issue - both the PC and the headset need attention.