Srivener Serial Name

I just bought Scrivener and received my license key, but I don’t know what to enter in the serial name field. I did not receive a name or use one to purchase Scrivener. I’ve seen people mention a link to eSellerate but I don’t have one.
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What version of Scrivener do you have? The Scrivener -> About Scrivener command will tell you.

We recently changed license providers. If you purchased since the switch, you’ll use your email address in place of the name, but you need to have Scrivener 3.1.3 installed.