Everyone is assigned one of the promos. There seems to be some IT issues regarding it not showing up for sone people. Noone has ever reported calling in, emailing, or leaving a pm for Marriott Concierge and not then having a promo show up,

There does not seem to be any pattern to those who hsve promos show up automatically and those that don't.

This issue is unrelated to the ability to switch to another promo once you determine which promo you have now. The ability to switch seems entirely dependent on the person you talk to.