It isn't working for me in Chrome and neither in Firefox 50.1 for Android.
However, Google Project Control Panel shows no request to Messaging API, so I don't think my phone is the problem
Edit: I receive meta push notifications so the problem is on my site. Plugin is activated and Push Notifications option marked as activated on both desktop and android Google Chrome and Firefox.
Edit 2: I migrated the GCM from Google Cloud Console to Google Firebase and changed the API key. It works now on android, but Notifications on Chrome for Mac only appear after another notification (e.g. Gmail) appears.