I couldn't figure this out via a LOT of clicking around my.esri.com. I eventually went back through my email from when I signed up. I found a link to my "Fulfillment Page" that got me what I needed. That fulfillment page is also at my.esri.com, but it opens with a special code in the URL. Once I found that, there were still quite a few steps, but the instructions were pretty clear. The overview of the process from the fulfillment page is to: Create an ArcGIS Online organization Create a user at your new organization Log in to your Organizational AGOL account and authorize yourself for ArcGIS Pro When you open Pro, log in as an enterprise account. Enter your organization's prefix, and then log in with the account created in step 2.
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