KACE Product Support

I have changed a number of my ticket rules to be based in the Timestamp column in the HD_TICKET_CHANGE table. I'm working on a post to explain why. However, I was checking that the rules were working and found that one rule was returning 0 results even though I know a Ticket meets the requirements. This particular rule selects all tickets that have been in status "New" for 10 days and sends an email to ticket owners that their ticket has not been changed in 10 days.

Here's the query:

SELECT
      -- ticket fields
      HD_TICKET.ID, -- $id
      HD_TICKET.ID AS TICKNUM, -- $ticknum
      HD_TICKET.TITLE, -- $title
      DATE_FORMAT(HD_TICKET.CREATED,'%b %d %Y %I:%i:%s %p') AS CREATED, -- $created
      DATE_FORMAT(HD_TICKET.MODIFIED,'%b %d %Y %I:%i:%s %p') AS MODIFIED, -- $modified
    
      -- change fields
      C.COMMENT, -- $comment
      C.DESCRIPTION, -- $description
      GROUP_CONCAT(CONCAT('----- Change by ', UPDATER.EMAIL,' at ',H.TIMESTAMP,' -----\n',
       H.DESCRIPTION,'\n',H.COMMENT,'\n\nPlease see your ticket at http://kbox.wacoisd.org/userui/ticket.php?ID=',H.HD_TICKET_ID,'\n')
       ORDER BY H.ID DESC SEPARATOR '\n') HISTORY, -- $history
    
    
      -- about the updater
      UPDATER.USER_NAME AS UPDATER_UNAME, -- $updater_uname
      UPDATER.FULL_NAME AS UPDATER_FNAME, -- $updater_fname
      UPDATER.EMAIL AS UPDATER_EMAIL,     -- $updater_email
      IF(UPDATER.FULL_NAME='',UPDATER.USER_NAME,UPDATER.FULL_NAME) AS UPDATER_CONDITIONAL, -- $updater_conditional
    
      -- about the owner
      OWNER.USER_NAME AS OWNER_UNAME, -- $owner_uname
      OWNER.FULL_NAME AS OWNER_FNAME, -- $owner_fname
      OWNER.EMAIL AS OWNER_EMAIL,     -- $owner_email
      IFNULL(OWNER.USER_NAME,'Unassigned') OWNER_USER, -- $owner_user
    
      -- about the submitter
      SUBMITTER.USER_NAME AS SUBMITTER_UNAME, -- $submitter_uname
      SUBMITTER.FULL_NAME AS SUBMITTER_FNAME, -- $submitter_fname
      SUBMITTER.EMAIL AS SUBMITTER_EMAIL,     -- $submitter_email
      -- about priority
      P.NAME AS PRIORITY, -- $priority
    
      -- about status
      S.NAME AS STATUS,   -- $status
    
      -- about impact
      I.NAME AS IMPACT,   -- $impact
    
      -- about category
      CAT.NAME AS CATEGORY, -- $category
    
      -- other fields
      HD_TICKET.CUSTOM_FIELD_VALUE0 AS LOCATION, -- $location
      HD_TICKET.CUSTOM_FIELD_VALUE1 AS ROOM, -- $room
      HD_TICKET.CUSTOM_FIELD_VALUE2 AS WISD_NUM, -- $wisd_num
      HD_TICKET.CUSTOM_FIELD_VALUE7 AS EQUIPMENT, -- $equipment
      HD_TICKET.CUSTOM_FIELD_VALUE5 AS DESCRIPTION, -- $description
      HD_TICKET.CUSTOM_FIELD_VALUE6 AS USER_EMAIL, -- $user_email

      -- -- example of static distribution list
      'helpdesk@wacoisd.org' AS NEWTICKETEMAIL -- $newticketemail
    
    
    FROM HD_TICKET
     /* latest change ***/ JOIN HD_TICKET_CHANGE C ON C.HD_TICKET_ID = HD_TICKET.ID
                            /*AND C.ID=<CHANGE_ID>*/
JOIN HD_TICKET_CHANGE LAST_CHANGE ON LAST_CHANGE.HD_TICKET_ID = HD_TICKET.ID
and LAST_CHANGE.ID=(select MAX(ID) from HD_TICKET_CHANGE where HD_TICKET_CHANGE.HD_TICKET_ID = HD_TICKET.ID)
     /* complete history*/ JOIN HD_TICKET_CHANGE H ON H.HD_TICKET_ID = HD_TICKET.ID
     /* priority ********/ JOIN HD_PRIORITY P ON P.ID=HD_PRIORITY_ID
     /* status **********/ JOIN HD_STATUS S ON S.ID=HD_STATUS_ID
     /* impact-severity */ JOIN HD_IMPACT I ON I.ID=HD_IMPACT_ID
     /* category ********/ JOIN HD_CATEGORY CAT ON CAT.ID=HD_CATEGORY_ID
     /* owner ***********/ LEFT JOIN USER OWNER ON OWNER.ID = HD_TICKET.OWNER_ID
     /* submitter *******/ LEFT JOIN USER SUBMITTER ON SUBMITTER.ID = HD_TICKET.SUBMITTER_ID
     /* updater *********/ LEFT JOIN USER UPDATER ON UPDATER.ID = C.USER_ID
     WHERE
(S.NAME = 'New' AND DATEDIFF(NOW(), LAST_CHANGE.TIMESTAMP) > 10 AND DATEDIFF(NOW(), LAST_CHANGE.TIMESTAMP) < 11)
    
      /* this is necessary when using group by functions */
    GROUP BY HD_TICKET.ID
    HAVING 1=1

I have a ticket #670 that is greater than 10 days and less than 11, but the query still returns 0 results. I queried HD_TICKET_CHANGE and see the timestamp for Ticket ID 670 that is correct. Any ideas why I am still getting 0 results?