Why can’t I receive push notification from Line application on Xiaomi Redmi 2? Normally, push notification is available when the chatting apps like WhatsApp, WeChat, Viber are in use or running in the back-end as background process. However, if you sign out or clear RAM of these apps, it might result of this unavailability of push notification. Seem like this is part of MIUI OS system behavior. Therefore, this issue might not be limited Redmi 2 only but all Xiaomi devices (Mi 3, Mi 4, Mi 4i, Redmi Note (3G/4G), Mi Note, Mi Note Pro) powered by MIUI 5 & 6. Anyway, there is a way to solve this problem.