Solution: Press F4 to Unmute, or turn on microphone from Quick settings on Lenovo Vantage.
Steps 1:
Press the F4 key on your Keyboard to unmute.
Follow the below if Step 1 doesn't work.
Step 2:
Launch Lenovo Vantage.
Follow the prompt if it’s the first launch of the application.
Scroll down the dashboard to Quick Settings.
Toggle the greyed out Mic icon to enable it.