Log in to Workday, then launch the "Create Requisition" task:

Select "Connect to Supplier Website," and finally select Amazon instead of logging in and shopping through Amazon.com directly.

All Amazon punchout purchases should originate via a session that was started by Workday's requisition process. A video outlining this process is also available here: https://drive.google.com/file/d/1DHIFFXAzFP7GV0d_TNbsF7kIBvg-i0tK/view?usp=sharing