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Might take some custom coding to pull the reviews from the database. You could turn on the schema for the review template. Google should be smart enough to read both schemas on the page.
Can you check them now?
I just filed a support ticket with the scraping service. They are looking in to it. I suspect that VRBO changed something on their end.
Check it now. That "still working... number 1 in queue" means that you are the next in line.
The VRBO Crawl method is currently down, however you can still get the reviews using the Review Funnel method. I'm working the Crawl method, but VRBO is getting at blocking web crawlers.
I've been developing on 8.3 so it should work. Make sure you are on the latest version of the plugin 12.5.2
Facebook has to be a publicly viewable page when not logged in.

Customer support service by UserEcho
https://search.google.com/test/rich-results