2015 Impreza voice activation button not working on steering wheel

[Musicatlover]

My voice activation button on steering wheel stopped working. Nothing happens when I press it to make phone calls or any voice commands. I have to use the screen to physically make phone calls when before I pressed the button & I heard-"Please say a command"...now nothing. Is there a fuse possibly that needs checked or replaced? How can I fix this button to work once again? Should I pop off the button & clean under it? All the other buttons on the steering wheel seem to be working, just the one next to the "source" button with the face outline won't work.