The fine print states: "
Cruise Fares are also not combinable with restricted pricing including, but not limited to, Exciting Deals, Going-Going-Gone, Travel Partner Rates, Interline Rates, Net Rates, Residential Rates, Senior Rates, Military Rates and Buy One Get Second Person Half Off promotion. The guest or travel agent may call Royal Caribbean for details regarding combinability with Price Programs. Cruise Rewards are valid only on oceanview or veranda staterooms. Companion Fares are not applicable on new ships during their first 13 months in operation, also known as, their “Inaugural Season” or Galapagos voyages. Value of the redemption is subject to change and may be reassessed if there is any change in pricing on the reservation."
https://www.royalcaribbean.com/content/dam/royal/resources/pdf/visa-signature/royal-caribbean-visa-signature-rewards-options.pdf