The Dongsen Island password is valid for one hour.
Check the code of your own island in Animal Crossing. Chinese method: Click the katakana in the lower right corner of the Animal Crossing keyboard interface, then compare it with the code table. First enter the two English letters on the code table, and a message will appear. An "@", and then enter the letters, numbers or symbols on the left side of the code table to type Chinese. This is how you can see your own island code.
The universal password *** has five characters.