Can't execute shutdown command (Predefined Action [!SHUTDOWN])

[brtlzr]

The Predefined Action [!SHUTDOWN] does not work.
Following error message is shown:

Can't execute shutdown command
Http failure response from http://localhost:5000/api/system/commands/core/shutdown
403 Forbidden

To Reproduce
Edit the config.json file
I've replaced the KILL button with a power-off button with following code:
{ "icon": "power-off", "command": "[!SHUTDOWN]", "color": "#e84118", "confirm": true, "exit": false }
Saved and rebooted my Pi.
Clicking the power button gives the 403-error.

Expected behavior
Clicking the power button sends the shutdown command and the Pi shuts down.

General Information:

• Raspberry Pi 3 Model B Rev 1.2
• Octopi image Version 0.17.0
• OctoDash Version v2.0
• OctoPrint Version 1.4.2

Additional context
My Pi is powered with a buck converter to my printer's power supply. I want to do a clean shutdown of the Pi before powering off my printer.

[UnchartedBull]

Please check your OctoPrint ACL and whether you have setup the shutdown scripts correctly as outlined here: https://community.octoprint.org/t/setting-up-octoprint-on-a-raspberry-pi-running-raspbian/2337 (Support restart/shutdown through OctoPrint's system menu)

[brtlzr]

Yes, I can shutdown/reboot the Pi through the Octoprint menu. I must say that all the stuff mentioned in the page you linked has been taken care of in the Octopi image.
One thing I am just thinking of... I made a dedicated user for OctoDash and use that user's API key. Could that be causing the problem?

[dexter323i]

@brtlzr That dedicated user must be in the Admins group. Operator is not enough for rebooting.

[UnchartedBull]

Probably what @dexter323i mentioned, please promote the OctoDash user to admin and try again.

[brtlzr]

I've just added the user to the admins group and that has fixed the issue.
Thanks for the support!