This is Azamara's list of prohibited items:
Prohibited Items
The following are examples of items that guests are not allowed to bring onboard. These and other similar items will be confiscated. Illegal drugs, flammable liquids, explosives, and dangerous chemicals will not be returned.
Firearms & ammunition, including realistic replicas
Sharp objects, including knives and scissors (Personal grooming items such as safety razors and scissors with blades less than 4 inches are allowed)
Illegal drugs & substances
Candles & incense
Coffee makers, clothes irons, & hot plates
Baseball bats, hockey sticks, cricket bats, bows & arrows
Skateboards & surfboards
Martial arts gear
Self-defense Gear, including handcuffs, pepper spray, night sticks
Flammable liquids and explosives, including lighter fluid and fireworks
HAM radios
Dangerous chemicals, including bleach and paint
Electric water kettles
Extension Cords and Multi-Plug Outlets/Power Strips
As you can see, electric kettles are prohibited.
I suggest that on embarkation you present the kettle to Guest Relations so that there can be no 'misunderstandings'.