Symptoms

in the SharePoint registration wizard, i am providing the URL of the K2 Server, after i was publish in the external DNS and allowed in the FW
https://hq-k2-prd.avgol.com
and got the following error
" A SmartForms runtime site could not be found in the autodiscover results"
 

Diagnoses

The issue was in workspace.

 

Resolution

Changed the workspace environment details to point to production and not Development.

Client was then able to register the app successfully.