My house has no address

Moved to Alentejo, house has no address, makes everything very difficult. Portugal does not have definitive land demarcation and ownership in a lot of places. The house I live in is part of a huge land that the government considers one plot. Only address I can use is a post box I got from the local post office, but a lot of services don’t accept post box addresses, including the government itself!

P.S. If you are thinking of buying land, or a house… good luck figuring out where your boundaries are and what your allowed land use is