Widget Connector does not work with password-protected videos on Vimeo

Customers are reporting that they were previously able to display password-protected Vimeo videos via the widget connector, but that this no longer works.

See the following comments on the doc pages:

Comment 1:
From: Rich Schone
URL of comment: https://confluence.atlassian.com/display/DOC/Widget+Connector+Macro?focusedCommentId=223221342#comment-223221342
Quote:

We are using the Widget macro to display password protected video from Vimeo. This has just stopped working. We have upgraded to the newest version of Widget. Example (screenshot given).

This screen use to bring up the password prompt from Vimeo; however, now we just get a black screen of death.
Any suggestions would be helpful.

Comment 2:
From: brad mcgilligan
URL of comment: https://confluence.atlassian.com/display/DOC/Widget+Connector+Macro?focusedCommentId=312738192#comment-312738192

Rich Schone Did you ever get a fix for this? I am trying to embed a vimeo video from my plus account but only allow embedding in my Confluence wiki - I have set the domain properly to mydomain.atlassian.net but I still get the Vimeo error message.

Comment 3:
From: Will Millar
URL of comment:

Rich Schone or brad mcgilligan — I'm looking to fix this as well. I am trying to sell my team on adopting Confluence, but this Vimeo issue is holding everything up! Anybody have any fixes or workarounds?

None of the Widget Connector macros (except for YouTube) will work on any computer I test on.