Karl,
I’ve seen this problem before, and in each case it was because the VUWER control page is not publicly viewable. You can see the control page, because your web browser is logged into your Google account. However, VUWER does not have your browser’s privileges.
Try this: log out of your Google account, and then try to view your VUWER control page. I am betting that it will be private, and you won’t be able to view it.
Or, alternatively just send me the web link of your VUWER control page. If I can’t see it, then VUWER won’t be able to see it, either.
Tim