Workflow Designer for Office 365 Stuck on Connecting to Site for Public Website

Issue

On a public website (online), when opening the workflow designer it is stuck on loading "Connecting to site".

Resolution

Use a global admin account to make these changes:

1. Switch the Public website to offline mode.
2. Remove the app - Workflow for Office 365.
3. Add the app back to the website - Work for Office 365.
4. Enter the license key.