How can I see Office 2019 for Mac product key

We use a shared account that has 25 licenses associated to it.

When we install Office 2019 on a Mac and activate it by signing in with the shared account it lists all licensed products but not the product keys, the list is all same like "Office Home & Business 2019" repeated 25 times. And when we select one randomly, actually we associate a product key on the computer but this information is not listed online or on the Office application’s help screens.

Microsoft has a document that recommends saving which product key is used on which computer and it guides the customer how to look up the product key on Windows but not on macOS.

We’d like to know how we accomplish that on macOS.