I understand, that a Medallion is required. The reason for this item, is for security needs of boarding and location of an individual. They are free and can be picked up at the port.
The Medallion, is used for everything from identity, to restaurant bookings (mDR or specialities restaurants), the on board shops, bars etc. and it’s used as a tracking device on board the ship.
keycards I understand we’re discontinued.
You must go thru the Medallion app or the online web version to complete the required process.
it’s rather painless and it’s rather useful. I’ve on my 14 cruise using the device.