Import from Visio 2016/2013 Greyed out in Designer

Good afternoon, all!

I've run into a problem with importing from Visio into Designer.  When I open the workflows and click "Import from Visio..." the option for Visio 2013 is greyed out.  Web searching has only come up with the idea that Workflow Manager is not installed on the SharePoint server.

However, when I try to add a new workflow, I do get the 2013 option.  Furthermore, I had major troubles installing Workflow Manager and ended up calling Microsoft to assist with the installation.  So, Workflow Manager is installed on the server.

Any other thoughts on why the option is greyed out?

Thanks to all for looking!

Gregg