Firebase push notifications UserSegment not working but topics does.

Hi, I have a new android project for a PoC. I am trying to set up firebase cloud messaging. The issue is, when I try to send a notification from the console to user segments it doesn't work. Notifications sent using topics are delivered. Test notifications are also delivered

From what I see in firebase analytics, it shows 0 active users and that may be the cause. But login and auth work. Analytics is also set up. I am on an emulator

I have also used this code for a test app and it worked then. So I am a bit lost on what the issue could be.