An error occurred while running the script. "ERROR: service.PERM_DENIED (permission denied: only admins can delete from dumpster)"?

Question

Zimbra

I'm trying to run a script to purge mail before a certain date

#!/bin/bash
export LC_ALL='ru_RU.UTF-8'     #
#
DOMAIN_NAME="terra-minora.ru"      #
BFRDATE="01/01/2021/"           #
EMAIL=/tmp/email.list           #
MESID=/tmp/mesid.list           #
MESID2=/tmp/mesid2.list         #
FLDNM=/tmp/folder.list          #
FLOG=/tmp/process.log           #
#####################################  #####################################
/opt/zimbra/bin/zmprov -l gaa $DOMAIN_NAME | sort > $EMAIL  #
#
#
#
for i in $(cat $EMAIL); #
  do
      echo "Clean email - $i before $BFRDATE" >> $FLOG #
      /opt/zimbra/bin/zmmailbox -z -m $i getallfolders |grep -i mess |sed -e "s/^\s\s*//" |sed -e "s/\s\s*/ /g"| cut -d" " -f5,6,7,8,9 > $FLDNM # 
      cat $FLDNM |while read f; #
          do
              echo "Clean $i folder $f" >> $FLOG #
              /opt/zimbra/bin/zmmailbox -z -m $i search -l 999 "in:\"$f\" (before:$BFRDATE)" |sed -e "s/^\s\s*//" |sed -e "s/\s\s*/ /g" | cut -d" " -f2 > $MESID # 
              tail $MESID -n +5 > $MESID2 #
              ##
              for a in $(cat $MESID2) #
                  do
                      if  #
                          then
                              MESSAGEID=${a#-} #
                              /opt/zimbra/bin/zmmailbox -z -m $i deleteMessage $MESSAGEID >> $FLOG #
                          else
                              /opt/zimbra/bin/zmmailbox -z -m $i deleteConversation $a >> $FLOG #
                          fi
                  done
              /opt/zimbra/bin/zmmailbox -z -m $i emptyDumpster #
              rm -f $MESID2 #
          done
  done

I get the error "ERROR: service.PERM_DENIED (permission denied: only admins can delete from dumpster)"
gave permission to the script
chown -R zimbra:zimbra /opt/zimbra/backup/scripts
chmod +x /opt/zimbra/backup/scripts
ran through zimbra account(su zimbra)