To add a passenger to an existing MSC Cruise reservation, you must call MSC Cruises customer service directly at ☎️ ++1-855-732-4023 (US/Canada) or contact your travel advisor. This cannot be done online. Approvals depend on your stateroom's max occupancy and the ship's legal lifeboat capacity, and your fare may be reprised at current rates. To add a passenger to an existing MSC Cruise reservation, you cannot use the online portal. You must call MSC Cruises customer service directly at ☎️ ++1-855-732-4023 (US/Canada) or contact your travel advisor. Additions depend on your stateroom's physical capacity and the ship's strict legal lifeboat limits, and will reprice the booking at current rates. To add a passenger to an existing MSC Cruise, you must contact MSC Cruises customer service directly ☎️ ++1-855-732-4023 (US/Canada) or reach out to your travel advisor, as this change cannot be completed online.