diff --git a/application/src/main/java/org/thingsboard/server/controller/AlarmController.java b/application/src/main/java/org/thingsboard/server/controller/AlarmController.java
index 26e61a495a..03a7f20c8c 100644
--- a/application/src/main/java/org/thingsboard/server/controller/AlarmController.java
+++ b/application/src/main/java/org/thingsboard/server/controller/AlarmController.java
@@ -374,13 +374,9 @@ public class AlarmController extends BaseController {
             throw new ThingsboardException("Invalid alarms search query: Both parameters 'searchStatus' " +
                     "and 'status' can't be specified at the same time!", ThingsboardErrorCode.BAD_REQUEST_PARAMS);
         }
-        UserId assigneeUserId = null;
-        if (assigneeId != null) {
-            assigneeUserId = new UserId(UUID.fromString(assigneeId));
-        }
         checkEntityId(entityId, Operation.READ);
         try {
-            return alarmService.findHighestAlarmSeverity(getCurrentUser().getTenantId(), entityId, alarmSearchStatus, alarmStatus, assigneeUserId);
+            return alarmService.findHighestAlarmSeverity(getCurrentUser().getTenantId(), entityId, alarmSearchStatus, alarmStatus, assigneeId);
         } catch (Exception e) {
             throw handleException(e);
         }
diff --git a/application/src/main/java/org/thingsboard/server/service/telemetry/DefaultAlarmSubscriptionService.java b/application/src/main/java/org/thingsboard/server/service/telemetry/DefaultAlarmSubscriptionService.java
index d6aa9cba26..dd4b9b6c55 100644
--- a/application/src/main/java/org/thingsboard/server/service/telemetry/DefaultAlarmSubscriptionService.java
+++ b/application/src/main/java/org/thingsboard/server/service/telemetry/DefaultAlarmSubscriptionService.java
@@ -165,8 +165,8 @@ public class DefaultAlarmSubscriptionService extends AbstractSubscriptionService
     }
 
     @Override
-    public AlarmSeverity findHighestAlarmSeverity(TenantId tenantId, EntityId entityId, AlarmSearchStatus alarmSearchStatus, AlarmStatus alarmStatus, UserId assigneeUserId) {
-        return alarmService.findHighestAlarmSeverity(tenantId, entityId, alarmSearchStatus, alarmStatus, assigneeUserId);
+    public AlarmSeverity findHighestAlarmSeverity(TenantId tenantId, EntityId entityId, AlarmSearchStatus alarmSearchStatus, AlarmStatus alarmStatus, String assigneeId) {
+        return alarmService.findHighestAlarmSeverity(tenantId, entityId, alarmSearchStatus, alarmStatus, assigneeId);
     }
 
     @Override
diff --git a/common/dao-api/src/main/java/org/thingsboard/server/dao/alarm/AlarmService.java b/common/dao-api/src/main/java/org/thingsboard/server/dao/alarm/AlarmService.java
index a6a61d01c5..848d6dd5b1 100644
--- a/common/dao-api/src/main/java/org/thingsboard/server/dao/alarm/AlarmService.java
+++ b/common/dao-api/src/main/java/org/thingsboard/server/dao/alarm/AlarmService.java
@@ -65,7 +65,7 @@ public interface AlarmService extends EntityDaoService {
     ListenableFuture<PageData<AlarmInfo>> findCustomerAlarms(TenantId tenantId, CustomerId customerId, AlarmQuery query);
 
     AlarmSeverity findHighestAlarmSeverity(TenantId tenantId, EntityId entityId, AlarmSearchStatus alarmSearchStatus,
-                                           AlarmStatus alarmStatus, UserId assigneeUserId);
+                                           AlarmStatus alarmStatus, String assigneeId);
 
     ListenableFuture<Alarm> findLatestByOriginatorAndType(TenantId tenantId, EntityId originator, String type);
 
diff --git a/dao/src/main/java/org/thingsboard/server/dao/alarm/AlarmDao.java b/dao/src/main/java/org/thingsboard/server/dao/alarm/AlarmDao.java
index 11c3e47599..f4bc66d4e4 100644
--- a/dao/src/main/java/org/thingsboard/server/dao/alarm/AlarmDao.java
+++ b/dao/src/main/java/org/thingsboard/server/dao/alarm/AlarmDao.java
@@ -59,7 +59,7 @@ public interface AlarmDao extends Dao<Alarm> {
 
     PageData<AlarmData> findAlarmDataByQueryForEntities(TenantId tenantId, AlarmDataQuery query, Collection<EntityId> orderedEntityIds);
 
-    Set<AlarmSeverity> findAlarmSeverities(TenantId tenantId, EntityId entityId, Set<AlarmStatus> status, UserId assigneeUserId);
+    Set<AlarmSeverity> findAlarmSeverities(TenantId tenantId, EntityId entityId, Set<AlarmStatus> status, String assigneeId);
 
     PageData<AlarmId> findAlarmsIdsByEndTsBeforeAndTenantId(Long time, TenantId tenantId, PageLink pageLink);
 
diff --git a/dao/src/main/java/org/thingsboard/server/dao/alarm/BaseAlarmService.java b/dao/src/main/java/org/thingsboard/server/dao/alarm/BaseAlarmService.java
index b0f904e71b..e1b38a0dd5 100644
--- a/dao/src/main/java/org/thingsboard/server/dao/alarm/BaseAlarmService.java
+++ b/dao/src/main/java/org/thingsboard/server/dao/alarm/BaseAlarmService.java
@@ -371,7 +371,7 @@ public class BaseAlarmService extends AbstractEntityService implements AlarmServ
 
     @Override
     public AlarmSeverity findHighestAlarmSeverity(TenantId tenantId, EntityId entityId, AlarmSearchStatus alarmSearchStatus,
-                                                  AlarmStatus alarmStatus, UserId assigneeUserId) {
+                                                  AlarmStatus alarmStatus, String assigneeId) {
         Set<AlarmStatus> statusList = null;
         if (alarmSearchStatus != null) {
             statusList = alarmSearchStatus.getStatuses();
@@ -379,7 +379,7 @@ public class BaseAlarmService extends AbstractEntityService implements AlarmServ
             statusList = Collections.singleton(alarmStatus);
         }
 
-        Set<AlarmSeverity> alarmSeverities = alarmDao.findAlarmSeverities(tenantId, entityId, statusList, assigneeUserId);
+        Set<AlarmSeverity> alarmSeverities = alarmDao.findAlarmSeverities(tenantId, entityId, statusList, assigneeId);
 
         return alarmSeverities.stream().min(AlarmSeverity::compareTo).orElse(null);
     }
diff --git a/dao/src/main/java/org/thingsboard/server/dao/sql/alarm/AlarmRepository.java b/dao/src/main/java/org/thingsboard/server/dao/sql/alarm/AlarmRepository.java
index 7320451cd5..6b28577851 100644
--- a/dao/src/main/java/org/thingsboard/server/dao/sql/alarm/AlarmRepository.java
+++ b/dao/src/main/java/org/thingsboard/server/dao/sql/alarm/AlarmRepository.java
@@ -154,7 +154,7 @@ public interface AlarmRepository extends JpaRepository<AlarmEntity, UUID> {
                                            @Param("affectedEntityId") UUID affectedEntityId,
                                            @Param("affectedEntityType") String affectedEntityType,
                                            @Param("alarmStatuses") Set<AlarmStatus> alarmStatuses,
-                                           @Param("assigneeId") UUID assigneeId);
+                                           @Param("assigneeId") String assigneeId);
 
     @Query("SELECT a.id FROM AlarmEntity a WHERE a.tenantId = :tenantId AND a.createdTime < :time AND a.endTs < :time")
     Page<UUID> findAlarmsIdsByEndTsBeforeAndTenantId(@Param("time") Long time, @Param("tenantId") UUID tenantId, Pageable pageable);
diff --git a/dao/src/main/java/org/thingsboard/server/dao/sql/alarm/JpaAlarmDao.java b/dao/src/main/java/org/thingsboard/server/dao/sql/alarm/JpaAlarmDao.java
index fae28ac916..64857269f7 100644
--- a/dao/src/main/java/org/thingsboard/server/dao/sql/alarm/JpaAlarmDao.java
+++ b/dao/src/main/java/org/thingsboard/server/dao/sql/alarm/JpaAlarmDao.java
@@ -181,11 +181,7 @@ public class JpaAlarmDao extends JpaAbstractDao<AlarmEntity, Alarm> implements A
     }
 
     @Override
-    public Set<AlarmSeverity> findAlarmSeverities(TenantId tenantId, EntityId entityId, Set<AlarmStatus> statuses, UserId assigneeUserId) {
-        UUID assigneeId = null;
-        if (assigneeUserId != null) {
-            assigneeId = assigneeUserId.getId();
-        }
+    public Set<AlarmSeverity> findAlarmSeverities(TenantId tenantId, EntityId entityId, Set<AlarmStatus> statuses, String assigneeId) {
         return alarmRepository.findAlarmSeverities(tenantId.getId(), entityId.getId(), entityId.getEntityType().name(), statuses, assigneeId);
     }
 
diff --git a/rule-engine/rule-engine-api/src/main/java/org/thingsboard/rule/engine/api/RuleEngineAlarmService.java b/rule-engine/rule-engine-api/src/main/java/org/thingsboard/rule/engine/api/RuleEngineAlarmService.java
index e41c7ad5d5..3afaf677d8 100644
--- a/rule-engine/rule-engine-api/src/main/java/org/thingsboard/rule/engine/api/RuleEngineAlarmService.java
+++ b/rule-engine/rule-engine-api/src/main/java/org/thingsboard/rule/engine/api/RuleEngineAlarmService.java
@@ -66,7 +66,7 @@ public interface RuleEngineAlarmService {
 
     ListenableFuture<PageData<AlarmInfo>> findCustomerAlarms(TenantId tenantId, CustomerId customerId, AlarmQuery query);
 
-    AlarmSeverity findHighestAlarmSeverity(TenantId tenantId, EntityId entityId, AlarmSearchStatus alarmSearchStatus, AlarmStatus alarmStatus, UserId assigneeId);
+    AlarmSeverity findHighestAlarmSeverity(TenantId tenantId, EntityId entityId, AlarmSearchStatus alarmSearchStatus, AlarmStatus alarmStatus, String assigneeId);
 
     PageData<AlarmData> findAlarmDataByQueryForEntities(TenantId tenantId, AlarmDataQuery query, Collection<EntityId> orderedEntityIds);
 }