Webinar registration pages on Facebook

So all of a sudden Facebook can't scrape og:image & og:description tags. The Sharing Debugger reports: This response code could be due to a robots.txt block. Please allowlist facebookexternalhit on your sites robots.txt config to utilize Facebook scraping

Tried creating a new webinar, and then a new event in two different accounts to no avail. Any else experiencing this? Adding the header image manually in FB is easy enough, but now it isn't clickable which is a downgrade in usability.