VSTS: Test Case Added from Work section not available in Test section

I added a Test Case from the Work area. Its been a week maybe so I don't remember if it was from the Backlog or the Board.

Now when I go to Test / Test Plans it is not showing up. I cannot find a way to add it to a Test Suite.

I can add Test Cases to Test Suites via the Test area.

Thanks for your help.