MAps will not find directions between any two locations.
It depends on where you are. The world is a big place.
Some places have no problems.
My Maps app finds lots of directions between locations. If this is occurring generally, apparently you have a defective phone or some bad setting.
However, as they work out the bugs, there are some problematic locations and directions. If you find these, you can report them to Apple within the app.
It simply stopped working for me. Even saved locations that worked a few days ago are now failing.
iPad 2, iOS ***, I mean six
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