We'd like to know more. Do you receive no notifications at all or just occassionally? If it's the latter, make sure to tap the bell > select "all notifications" for the specific channel and then you’ll receive notifications for all uploads and live streams. Keep us posted.
Noted! Can you send a feedback report from either device with more info: https://goo.gl/WdI0BK ? You may not receive an individual response, but the details will help us identify and fix any issues. Thanks.