Go into your Walt Disney World credential in your mobile wallet. There should be a section that says "Affiliations."
The spot that says "
DVC-Y" will turn into "DVC-BY."
Regardless, they fixed their systems about two years ago where they can validate all of your credentials with a tap of MagicBand or room key or card or whatever ticket media you have. Even setting MMB aside, this same system is how they validate whether someone is a Direct owner who is eligible for membership extras or a resale-only member who is not.
You should never have to actually SHOW a cast member anything other than maybe a photo ID. If you're asked to show them anything beyond just tapping their tablet, the CM is poorly trained.
cc
@airjay75