title: Can not get expo push token
body: <p>I am building a React native app which is based on Expo , i use Expo's push notification . when i test app with expo cli i get the expo token . and after i generate a .aab and i post it on play store . i can't get the expo token from any device . i don't know why .</p>
  <pre><code>registerForPushNotification = async() =&gt; {
      // Check for existing permissions
      const {status} = await Permissions.getAsync(Permissions.NOTIFICATIONS);
      let finalStatus = status;
  
      // if no existing permission, ask user for permission
      if (status !== 'granted') {
          const {status} = await Permissions.askAsync(Permissions.NOTIFICATIONS);
          finalStatus = status;
      }
  
      // if no permission, exit the function.
      if (finalStatus !== 'granted') {
        alert('Failed to get push token for push notification!')
        return;}
  
      // get push notification token.
      let token = await Notifications.getExpoPushTokenAsync();
      alert(token)
      firebase.database().ref('/users/usersInfo/'+user).update({
        expoToken:token
      })
  
      if (Platform.OS === 'android') {
        Notifications.createChannelAndroidAsync('default', {
          name: 'default',
          sound: true ,
          priority: 'max',
          vibrate: [0, 250, 250, 250],
        });
      }
    }
  </code></pre>