You may have noticed today that video embeds from YouTube are no longer working in Apostrophe. This is actually due to a YouTube bug: their video pages are issuing http: meta tags for oembed discovery, but the use of those http: URLs results in a 403 error because only https: is not allowed.
We have issued an update to the oembetter package to address this. If you npm update your apostrophe project you should get that fix.