ok, this docs are goob, but not all

after many tries:

curl -s -X POST http://..:8001/routes/.../plugins \
--data name=openid-connect \
--data config.issuer=https://.../.../.well-known/openid-configuration \
--data config.client_id=... \
--data config.client_secret=... \
--data config.ssl_verify=false \
--data config.verify_signature=false \
--data config.consumer_optional=false \
--data config.ssl_verify=false \
--data config.introspection_endpoint=https://.../.../protocol/openid-connect/token/introspect \
--data config.introspect_jwt_tokens=false \
--data config.introspection_hint=access_token \
--data config.auth_methods=introspection \
--data config.scopes_claim=scope \
--data config.reverify=true \
--data config.cache_tokens=false \
--data config.cache_introspection=false \
--data config.scopes_required=... | python -mjson.tool

it's a good idea replace ... with the rights words ;-) 

SOLVED

I create :

/etc/iscagent/iscagent.conf

application_server.port=2188
mirroring.console_logging_enabled=true
logging.minimum_severity=1

privileges.user=root

systemctl restart iscagent
 

After that file /var/log/iscagent_console.log, no more empty file.

no more errors after that