To have the best message receive experience on Lenovo Phones, please do the following.
Step 1: Open your device 'Security' settings
Step 2: Now tap on "Speed"
Step 3: Now tap on "AutoStart Management"
Step 4: Select hike from this list and turn ON the slider such that it turns to Blue.
Step 5: Now go back to the "Autostart Management" screen and tap on "Protected List"
Step 5: Tap on "Add" and select "hike"
And you're done. Now you should start receiving notifications properly from hike app. For any other questions/comments, submit your query at Support@hike.in and we will get back to you as soon as possible.