make me admin

I suspect the following line might be the issue:
echo "Removing $userToRemove's admin privileges" (line 78)

try changing it to:
echo "Removing $userToRemove admin privileges" (notice removal of ')

I can't test on my work machine since security would have a field day...but hope that helps.

Thanks @roiegat  

now i have different output:

#!/bin/bash

###############################################
# This script will provide temporary admin #
# rights to a standard user right from self #
# service. First it will grab the username of #
# the logged in user, elevate them to admin #
# and then create a launch daemon that will #
# count down from 30 minutes and then create #
# and run a secondary script that will demote #
# the user back to a standard account. The #
# launch daemon will continue to count down #
# no matter how often the user logs out or #
# restarts their computer. #
###############################################

#############################################
# find the logged in user and let them know #
#############################################

currentUser=$(who | awk '/console/{print $1}')
echo "$currentUser"

osascript -e 'display dialog "You now have administrative rights for 30 minutes. DO NOT ABUSE THIS PRIVILEGE..." buttons {"Make me an admin, please"} default button 1'

#########################################################
# write a daemon that will let you remove the privilege #
# with another script and chmod/chown to make #
# sure it'll run, then load the daemon #
#########################################################

#Create the plist
sudo defaults write /Library/LaunchDaemons/removeAdmin.plist Label -string "removeAdmin"

#Add program argument to have it run the update script
sudo defaults write /Library/LaunchDaemons/removeAdmin.plist ProgramArguments -array -string /bin/sh -string "/Library/Application Support/JAMF/removeAdminRights.sh"

#Set the run inverval to run every 7 days
sudo defaults write /Library/LaunchDaemons/removeAdmin.plist StartInterval -integer 1800

#Set run at load
sudo defaults write /Library/LaunchDaemons/removeAdmin.plist RunAtLoad -boolean yes

#Set ownership
sudo chown root:wheel /Library/LaunchDaemons/removeAdmin.plist
sudo chmod 644 /Library/LaunchDaemons/removeAdmin.plist

#Load the daemon
launchctl load /Library/LaunchDaemons/removeAdmin.plist
sleep 10

#########################
# make file for removal #
#########################

if [ ! -d /private/var/userToRemove ]; then
mkdir /private/var/userToRemove
echo "$currentUser" >> /private/var/userToRemove/user
else
echo "$currentUser" >> /private/var/userToRemove/user
fi

##################################
# give the user admin privileges #
##################################

/usr/sbin/dseditgroup -o edit -a "$currentUser" -t user admin

########################################
# write a script for the launch daemon #
# to run to demote the user back and #
# then pull logs of what the user did. #
########################################

cat << 'EOF'
/Library/Application\\ Support/JAMF/removeAdminRights.sh
if [[ -f /private/var/userToRemove/user ]]; then
userToRemove="$(cat /private/var/userToRemove/user)"
echo "Removing $userToRemove admin privileges"

/usr/sbin/dseditgroup -o edit -d $userToRemove -t user admin
rm -f /private/var/userToRemove/user
log collect --last 30m --output /private/var/userToRemove/$userToRemove.logarchive
launchctl unload /Library/LaunchDaemons/removeAdmin.plist
rm /Library/LaunchDaemons/removeAdmin.plist

fi
EOF

exit 0

looks like the script was executed without anyone logged in based on the _mbsetupuser indicating the mac was in set-up mode when the script got activated.