The other problem we have had looking for charging stations in unfamiliar locations with parking garages is that the navigation system can't or doesn't make it clear which level of a garage you want. Plus, once you are inside a garage, it is sometimes harder for the car to communicate with the satellites, so it can lose track of where you are. There is hardly ever a sign directing us to a charging locations (either Tesla superchargers or public chargers), which would help considerably.
PlugShare is hugely helpful in this regard - usually there’s a note with the location. Hard to do when you’re driving, of course, but if you have a copilot or can pull over for a bit then it’s great. For example, the Cambridge MA supercharger has a whole paragraph describing how to find it.