The same issue I am facing, Project runs in Unity Editor as aspected but stuck in android device not recognize any image and perform task.
Unity Version: Unity 2018.4.1f
EasyAR Version : 3.01
as per log In Edditor:-
[EasyAR] oframe is null
Cloud status Reconnecting target number 0
Cloud status TargetsNotFound target number 0
In Andoird :
[EasyAR] oframe is null
No more log after this ... not working anything ...