Supplier Portal notifications to the buyer for a contract

This may be one of those things where we're grossly overlooking something very obvious, but when a supplier sends a notification to the buyer via the Supplier Portal for a contract as per the 25D functionality:

https://docs.oracle.com/en/cloud/saas/readiness/scm/25d/proc25d/25D-procurement-wn-f39495.htm#Steps-to-enable-and-configure

it seems like the buyer gets an email from Oracle (not from the Supplier) with NO context.

Our buyers are getting emails but they don't know who it's from. The Subject is just free form text and the text body doesn't have anything. If the user doesn't add a signature, there's additional metadata or links attached to the email to tell the Buyer which supplier sent this and for which contract.