Fix group retrieving issues

components/device-mgt/io.entgra.device.mgt.core.device.mgt.core/src/main/java/io/entgra/device/mgt/core/device/mgt/core/service/GroupManagementProviderServiceImpl.java

@@ -673,7 +673,7 @@ public class GroupManagementProviderServiceImpl implements GroupManagementProvid
     @Override
     public DeviceGroup getUserOwnGroup(int groupId, boolean requireGroupProps, int depth) throws GroupManagementException {
         PrivilegedCarbonContext ctx = PrivilegedCarbonContext.getThreadLocalCarbonContext();
-        String username = ctx.getUsername() + "@" + ctx.getTenantDomain(true);
+        String username = ctx.getUsername();
         int tenantId = ctx.getTenantId();
         List<Integer> userOwnGroupIds = this.getGroupIds(username);
         if (userOwnGroupIds == null) {