I just downloaded the 1.9.0 final release, started the standalone server, created the initial admin user account and then tried to log in the admin console. I got the following error at that point:

Failed client authentication: org.keycloak.authentication.AuthenticationFlowException: Client was not identified by any client authenticator

The web page kept loading and the server had a lot of instance of the error above. I couldn’t go any further. What did I miss?