We created a SharePoint add-in for with VS 2017.
It asked for our SharePoint on-premises url, no problem.
Go to add a work flow, choose lists, in the wizard, come to it asking to have VS associate with the lists we already have in our SharePoint site...and the lists drop down is empty...
I also tested this with our team site on SharePoint online, same results.
Any clue what we can look for?