Just copying the solution you found yourself so that this question can be marked as resolved (so it vanishes from the list of unanswered posts):
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*** Nevermind. I just noticed a new email stuck in my junk folder that instructed me to log into the Developer Portal. This was in addition to the prompt from within Studio Pro that instructed me to log into my Mendix account. Once I logged into the Developer Portal, I can now see the different Starting Points. I'm leaving this for any other new users who have this same question.