Hi
As mentioned by Scott, It anly works of Classic UI. Not all functionality in Classic is available in Touch UI.
Link:- https://docs.adobe.com/docs/en/aem/6-1/administer/operations/tools-consoles.html
If you would see the list of tools, Scaffolding is only available in Classic UI section as compared to Touch UI,
I hope this would help you.
Thanks and Regards
Kautuk Sahni
Kautuk Sahni