PS with regards to above comment the login.10.60.18.186.xip.io literal appears not only under the route_registrar, but also here (should it be changed as well?):

login:
authorities: oauth.login,scim.write,clients.read,notifications.write,critical_notifications.write,emails.write,scim.userids,password.write
authorized-grant-types: authorization_code,client_credentials,refresh_token
autoapprove: true
override: true
redirect-uri: https://login.10.60.18.186.xip.io