To be honest why do I stop the game and uninstall this because if you're playing on phone it required to game keep open which can cause battery hot for running entire times.
Not mention this game can't do offline afk, if they can provide offline afk let's say if the player didn't online more than 24 hours. They won't get offline afk, that would be more efficient than staying online for 24/7.
Beside have to keep open game which make a problem when need to access other apps while afk. When you switch to other apps even though the game still in background, for some reason the game reconnect back not stay online. If you said it might be the phone not support, than why CODM, PUBG, Dragon Raja and many more was fine to change other apps and still running in background when switch back...
Mentioned games