I too have this issue.
And despite me having created a new topic on the issue of how/where adding domains (and you’d think that if the option was removed when actually creating the widget, the documentation would be updated somehow).
Google is of no help, just more ‘widget not working’ posts with no solution.
Heck, I can’t even post the code in a reply!
It’s been 72hrs now at still awaiting approval for posting?
lame…