If your car has Sensus connect and you can see this message, when you push the button NAV, or you can see in VDASH, that your car has Navi map region for some country like Europe or USA, then you can activate navigation in your car with lifetime map updates for free!
You can see this message in your car:
Or you have this buttons:
Then you can just activate navigation thru this menu in VDASH:
After this you need to lock car for at least 5-min.
Sometimes is also needed to change region of the car to accept new map data - see more here at the end of the article: https://d5t5.com/wiki/vdash/article-volvo-engineering-mode-change-region
After this you can download map updates from here: https://www.volvocars.com/uk/support/downloads/maps/mca