Duo: Forbidden 403 Error

If you are not able to load the Duo webpage after signing into a Swarthmore resource (like Zoom), check your system clock

The image below shows the error:

macOS System Clock

Go to he Apple menu > System Settings
Click General
Click Date & Time
For more information and to see instructions for different versions of MacOS, go to Set the date and time automatically on your Mac

Windows System Clock

To View the Timezone:

Click on the bottom right corner of the desktop where the time and date are located.
Click on the Date and Time settings link at the bottom of the popup window.
You are now able to view and customize the time zone.
For more information, go to how to set your time and time zone in Windows 10