The membership at the AG DSN is linked to persons and not to apartments. Because of that has every sublessee to become a member.
If you have a sublessee who is not (yet) a member of the AG DSN, is it your duty to inform us so that we can shut down your internet connection for the time of your absence. Simply send us an email after your return and we will reactivate your connection.
Note that sharing your account data is a violation of your contract. You are fully responsible in case of any misuse which is referable to your connection!