getting --> AbortError: Registration failed - push service error

[rahuldey7]

Followed everything mentioned in the readme of this repo.

In my mysite/requirements.txt I have: fcm-django coreapi django-cors-headers djangorestframework django-sslserver Django six urllib3 pyyaml

both servers frontend and backend are running smoothly. Granted permission for notiification on BRAVE BROWSER. But in the console I get this An "error occurred while retrieving token. AbortError: Registration failed - push service error"

error:

I even tried running the backend on ssl server but it does not work.

[EDIT] I tried this on Chrome and got this error