11.0.2 and server cause 404

Created a Keycloak 11.0.2 server.
Created a new React JS client using keycloak-js version 11.0.2 to match the server.

When the React app starts it tries to authenticate with Keycloak and the JS library sends the browser to ‘realms/myrealm/protocol/openid-connect/3p-cookies/step1.html’ and gets back a 404 from the keycloak server.

Others are reporting the same issue but not sure if anyone here has and if so, which bug tracking system do I log and track this on?