Hi @cpbpm - this looks like a cache issue and a wrong URL, not an issue with the Docker config.
for the Identity callback Invalid parameter error, I suspect it will be resolved if you clear your cache. Sometimes there is a stuck session value in the browser that causes this. To be more specific, if you go to the “Storage” tab of the browser devtools (I think it’s under “Application” in Chrome? I use Firefox primarily so I’m not 100% sure), you can remove anything under Cookies and Local and Session Storage for these localhost domains. Then close the tab and try again. You can also try in a private/incognito window.
for the Keycloak URL, you are missing the path - the URL in the default docker-compose config is http://localhost:18080/auth - you are missing the /auth path.