The system won't let you make 2 accounts (with different names) under the same email that's interesting must be an update because back in 2014 I created my sister an account under my email (she didn't have an email at that time) and so technically we both had an account under my email up until she updated to her own email a couple years a go (I still randomly get her monthly emails to this day) maybe they think it would be a duplicate.
You could always call 800-435-9792 and maybe they can create the account under the same email as I know several people do share an email address.
Another thought if you have a work email use that for creating the account.
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