Please follow these steps to diagnose the issue.
1. Make sure you are on Android 4.3 or above
2. Make sure you are on the latest version of Google Chrome from Playstore
3. Turn on your Bluetooth and also your Location Services (for Android 6 on wards only)
4. If you still do not see notifications, open Chrome browser and type in address bar:
and hit enter
5. List of settings open up. Click on "Enable the Physical Web" and choose "Enabled". See screenshots attached.
6. Chrome will prompt to relaunch the browser. After which you should be able to see the notification when you pull down the notification drawer.
See attached screenshots.