I find it somewhere which solve my problem :

*_Hola,
the doc is a bit outdated.
With the UPS 1.2.0, you need to bring your own Keycloak server. UPS needs to be linked against its URL.
Here is a sample for Keycloak in docker, and how to get the connection between them:
https://github.com/aerogear/aerogear-unifiedpush-server/tree/master/docker-compose/development
HTH,
Matthias_*

Thanks