Unable to make a std user as an admin

So if understood, you need 2 scripts: 

One which can elevate the access from standard to Admin and other to remove admin access after enrolling the devices, correct?

You might want to post the contents of your promote.sh script so we can see what you're doing in it. I have a feeling the way you're trying to make the user an admin is wrong. You don't want to be touching the sudoers file.

Yes, you are right.

#!/bin/sh

##########################################################################################
# License information
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#
# Copyright (c) 2021, JAMF Software, LLC. All rights reserved.
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# modification, are permitted provided that the following conditions are met:
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
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# * Neither the name of the JAMF Software, LLC nor the
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# derived from this software without specific prior written permission.
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# DISCLAIMED. IN NO EVENT SHALL JAMF SOFTWARE, LLC BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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##########################################################################################
#
# Version: 1.0
# Written by: Armin Briegel | Consulting Engineer | Jamf
#
# DESCRIPTION
# This script will add the currently logged in user (if any) from the admin group,
# thus providing access to administrator privileges.
#
# This script provides no mechanism to automatically demote the user again.
# If the demoteUser.sh script is running from a recurring policy, admin privileges will
# be removed the next time the demoteUser.sh script runs.
#
# DEPLOYMENT
# Deploy this as a Self Service policy script in Jamf Pro.
#
##########################################################################################
##########################################################################################

export PATH=/usr/bin:/bin:/usr/sbin:/sbin

currentUser=$( echo "show State:/Users/ConsoleUser" | scutil | awk '/Name :/ { print $3 }' )

# if no current user, exit quietly
if [ "$currentUser" == "loginwindow" ]; then
# no user logged in
echo "no user logged in, exiting"
exit 0
fi

# is the current user in the admin group?
if dseditgroup -o checkmember -m "$currentUser" admin; then
echo "$currentUser is already in the admin group"
else
# remove the user from the admin groups
echo "adding $currentUser to admin group"
dseditgroup -o edit -a "$currentUser" -t user admin
fi

Ok, so nothing looks off in your script there. It's a script from Armin Briegel, so it should be A-OK. It's using the approved method of making a user an admin, dseditgroup

My other question is, is the localuser account an admin already? In your screenshot you're trying to run this script from that account, but it requires that user to be an admin account already to do anything with sudo. I assume you know that, but just wanted to check that it wasn't something simple like that.

Correct Piyush Verma