if anyone had this problem before in signing in through browser to keycloak
here's the url of signing in http://localhost:14082/realms/springboot-test/protocol/openid-connect/auth?client_id=react-app&redirect_uri=http://localhost:3000/api/auth/callback/keycloak&response_type=code&scope=openid
and got this 401 username missing
make sure in the authentication tab you bind browser to default browser flow click here to see image