Unexpected error when authenticating

Hi, I checked out the repo and followed the steps from the readme. When the QR code is presented, I get redirected back to key-server after 3 seconds and key-server displays:

The key-server logs say:

2022-12-20 07:27:53,529 ERROR [org.keycloak.broker.oidc.AbstractOAuth2IdentityProvider] (executor-thread-34) Failed to make identity provider oauth callback: org.keycloak.broker.provider.IdentityBrokerException: No access_token from server. error='invalid_client', error_description='null', error_uri='null'
        at org.keycloak.broker.oidc.OIDCIdentityProvider.verifyAccessToken(OIDCIdentityProvider.java:524)