TomTom Go running
Under Settings the the wheel in a circle.
Then Appearance
Then Show contacts on map
Now you will have to zoom in to see them.
That way the screen is not full of contacts while you are driving.
You zoom in to pick the contact you want first.
Pick the one you want to go to and drive.......
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Also check you permissions.
On your phone
TomTomGO off
Settings
Apps
TomTom Go
give all the permissions.
Close everything and start TomTomGo again and it will work.
If you still have problems the a clean install might be needed and download your map again.
If that still does not work you will have to take it up with TomTom Direct........