PushNotification token are not acquired in standalone .apk ?

Hello everyone. I am trying to build an application. It works good, when expo app is working in background. If I turn expo app. Or when I am trying to acquire pushtoken in standalone .apk, I cannot acquire push-token. But when I install expo app, and turn it on, standalone app can acquire push token too. Is there any way I can acquire push-token in standalone .apk app, without need of expo client app be working in background?