When you enter a street address or place name into the app, the location shown is not yet very accurate. It might be the middle of a building, or on a nearby road. Make sure you follow all the steps to narrow the location you need down to the exact 3 metre square.
1. Tap the search bar, enter a street address or place name, then select the correct search result.
2. Zoom in and switch to satellite view to see more detail.
3. Drag the map if you need to, until you can see the precise location you want the address for.
4. Tap the exact square you need to see its what3words address display at the top of the screen.