just made this tutorial due to how many android related issues ive seen on answerhub the past few days, this should fix your issue 
UNREAL ENGINE 4.24 TUTORIAL: HOW TO PACKAGE YOUR GAME FOR ANDROID - YouTube
just made this tutorial due to how many android related issues ive seen on answerhub the past few days, this should fix your issue UNREAL ENGINE 4.24 TUTORIAL: HOW TO PACKAGE YOUR GAME FOR ANDROID - YouTube