I am trying to integrating keycloak with angular but I am facing issue invalid_redirect_uri/Page_not_found error.
Spent hours on googling but failed.
Since it too long for a comment I will post here.
I am assuming you have not changed the default keycloak port, there is only one possible issue I see
By default keycloak quarkus has removed the /auth from it api's and you need to explicitly set if you require this property.
http-relative-path=/auth
This can be set in the keycloak.conf file in /conf directory.