Stage Input step popup was currently working on 2.15. After an upgrade to 2.17, Input step popup is not appearing.

example

When you are using Pipelines and you are using the View Pipeline plugin, you should run your project and execute your input steps inside a STAGE, for example:

This should show a popup on stage view like this example it's not working anymore on the new versions 2.16 and 2.17

stage 'check-in' 
node ('master') { 
  input 'Are you sure?' 
}