diff --git a/src/main/java/de/itvsh/kop/user/UserResourceMapper.java b/src/main/java/de/itvsh/kop/user/UserResourceMapper.java
index c3455d6e23e6c427349644f76b99798464a0418a..82f9c22b2d2af9b497bbc17ee19433ee52b32525 100644
--- a/src/main/java/de/itvsh/kop/user/UserResourceMapper.java
+++ b/src/main/java/de/itvsh/kop/user/UserResourceMapper.java
@@ -1,5 +1,6 @@
 package de.itvsh.kop.user;
 
+import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Date;
 import java.util.List;
@@ -10,7 +11,6 @@ import javax.inject.Inject;
 
 import org.keycloak.admin.client.resource.UserResource;
 import org.keycloak.representations.idm.ClientMappingsRepresentation;
-import org.keycloak.representations.idm.GroupRepresentation;
 import org.keycloak.representations.idm.RoleRepresentation;
 import org.mapstruct.Mapper;
 import org.mapstruct.Mapping;
@@ -43,13 +43,12 @@ public abstract class UserResourceMapper {
 	}
 
 	List<String> mapOrganisationsEinheitIds(UserResource userRes) {
-		return userRes.groups().stream()
-				.map(GroupRepresentation::getAttributes)
-				.filter(Objects::nonNull)
-				.map(attributeMap -> attributeMap.get(properties.organisationsEinheitIdKey()))
-				.filter(Objects::nonNull)
-				.map(attributeValues -> attributeValues.get(0))
-				.toList();
+		return getOrganisationsEinheitIdsFromUserAttributes(userRes);
+	}
+
+	private List<String> getOrganisationsEinheitIdsFromUserAttributes(UserResource userResource) {
+		var attributes = userResource.toRepresentation().getAttributes();
+		return attributes != null ? attributes.get(properties.organisationsEinheitIdKey()) : new ArrayList<>();
 	}
 
 	List<String> mapRoles(UserResource userRes) {
@@ -65,7 +64,8 @@ public abstract class UserResourceMapper {
 
 	String mapId(UserResource userRes) {
 		var userRepresentation = userRes.toRepresentation();
-		var id = userRepresentation.getAttributes().get(properties.ldapIdKey());
+		var attributes = userRepresentation.getAttributes();
+		var id = attributes != null ? attributes.get(properties.ldapIdKey()) : null;
 		return id != null ? id.get(0) : userRepresentation.getId();
 	}
 
diff --git a/src/main/resources/application-remotekc.yaml b/src/main/resources/application-remotekc.yaml
index cd0cdf9c0320520665e35e918241cb1406c308b9..f16c633e13820f042de61db668301921d9e4ffb1 100644
--- a/src/main/resources/application-remotekc.yaml
+++ b/src/main/resources/application-remotekc.yaml
@@ -6,5 +6,6 @@ usermanager:
       user: goofyApiUser
       password: S9UEMuLG9y9ev99
       realm: sh-kiel-dev
+      organisations-einheit-id-key: organisationseinheitId
 keycloak:
   url: https://sso.dev.ozg-sh.de/auth
\ No newline at end of file
diff --git a/src/test/java/de/itvsh/kop/user/keycloak/KeycloakApiServiceITCase.java b/src/test/java/de/itvsh/kop/user/keycloak/KeycloakApiServiceITCase.java
index 93e6cbb5fc55face82e3425bd2d633ba027dbf30..7dc6275081eacc25859c1887b38d75cba2573093 100644
--- a/src/test/java/de/itvsh/kop/user/keycloak/KeycloakApiServiceITCase.java
+++ b/src/test/java/de/itvsh/kop/user/keycloak/KeycloakApiServiceITCase.java
@@ -1,11 +1,11 @@
 package de.itvsh.kop.user.keycloak;
 
+import static org.assertj.core.api.Assertions.*;
+
 import javax.inject.Inject;
 
 import org.junit.jupiter.api.Test;
 
-import static org.assertj.core.api.Assertions.*;
-
 import io.quarkus.test.junit.QuarkusTest;
 import io.quarkus.test.junit.TestProfile;
 
@@ -18,7 +18,7 @@ class KeycloakApiServiceITCase {
 
 	@Test
 	void shouldGetAllUsers() {
-		var usersStream = service.findAllUser();
+		var usersStream = service.findAllUser().toList();
 
 		assertThat(usersStream).isNotEmpty();
 	}