When moving in or out, always file a move-in notification to the housing cooperative’s resident register. For example, if you lose your key, the apartment door can only be opened to a person on the resident register. A change of name to the apartment door and the staircase board or mailbox also requires a move-in notification.
This notification to the housing cooperative does not replace the statutory notification of change of address to the local register office, which you can make via this link.