android does not recognize target area

Hi, I did a scan with the Matterport scanner, I generated a target area through the software generator. Once imported on Unity 3d, (I inserted both ARCamera and Area Target in the project and checked both simulate occlusion and mesh collider) I inserted some objects inside the target area. now if I go to simulate everything on the Unity play, I can see the objects. If I do the android build, I don't see anything. where am i wrong? (the devices where I install the build support ARCore) thanks for the help