Foreign residents must declare temporary residence if their landlords cannot support local registration. They must do so by August 15: https://hochiminh.xuatnhapcanh.gov.vn/faces/create_profile_acount.jsf
Alternatively, foreigners may provide instructions to their landlord by providing them with this document.
The “foreigner” will ultimately be the one responsible on whether this task is completed and could face a 20,000,000VND fine or deportation if found living unregistered after August 15, 2023.