Question - I suddenly started getting "Unauthorized" errors in the reports. It's only affecting Android platform.
It seems that your project was not migrated from GCM to Firebase and it's definitely the right time to do that now.
In order to get rid of those "Unauthorized" errors it's essential to import your Google Project to Firebase according to the following guide:
Please note that you'll also need to use a freshly generated FCM Token instead of the legacy API Key in the app configuration in Pushwoosh Control Panel.
Otherwise, push notifications won't be working for this particular project.