When I register a new user this error shows up: `W/Firestore(22296): (22.1.1) [Firestore]: Write failed at brews/...: Status{code=PERMISSION_DENIED, description=Missing or insufficient permissions., cause=null}` My Firestore rules: ``` service cloud.firestore { match /databases/{database}/documents { match /{document=**} { allow read, update, write: if request.auth != null; } } } ``` The brews collection doesn't get created. What am I doing wrong?