I have similar problem as the issue link below
https://github.com/Pushwoosh/pushwoosh-phonegap-plugin/issues/60
Any idea how to solve this problem? Do I have to manually configure something in the AndroidManifest.xml or android.json?
use the below plugin
https://github.com/phonegap/phonegap-plugin-push
and follow the below link to complete the procedure to complete the process of push notifications.
https://devdactic.com/ionic-push-notifications-guide/
this will give you complete idea to implement push notifications.