Nextcloud<->via Social Login<->OpenID Connect<->SSo Keycloak

version: Nextcloud 17.0.1 under docker.

Problem is name of user 's name on list of the users inside Nextcloud. The names of the users authenticated via sso are like: kaycloak-c4449065-895b-4fc2-8dad-09f6531932ae.

Could i do something with mapping with this ? . I have seen such option in Wordpress CMS and also i can do mapping when i integrate nextcloud with Active Directory (LDAP) but a not able do mapping with app Open ID Connect.