How to click on CTRL+M (Control + M) in WebdriverIO

I have to issue a CTRL+M action in WebdriverIO, but it is not working.

I have tried using different ways such as:

• browser.keys('Control').keys('m');
• browser.keys(['Control','KeyM', 'NULL']);
• browser.keys(['Control', 'm', 'NULL']);
• browser.keys('Control').keys('KeyM');
• browser.deviceKeyEvent(82); browser.pressKeycode(82); browser.keys('MENU');

None of the above are working. Can anyone help me?