I don’t know what happened on December 18, 2020, but Vimeo links posted on any Discourse site play without audio when using the iOS DiscourseHub app (at least on iPad, I don’t have an iPhone to test). Also, clicking on the progress bar makes the video permanently freeze.
Videos created before Dec 18 are unaffected by this (I post Vimeo links every day, so I was able to narrow it down to this date).
Here’s an example link without any embed restrictions https://vimeo.com/508864124/fcbbcc92fa. On desktop it plays fine, but if you use the DiscourseHub app on an iPad, there’s no sound and it freezes if you jump forwards/backwards.
Also, some of my users have reported this behavior when using Chrome and Safari on iPad, but using those browsers works well on my iPad.
I contacted Vimeo and they said they “do not support use of the Vimeo Player within webapps, in-app browsers, or hybrid apps”, so not much help on their part. Some of my users mentioned they also saw the issue using Chrome and Safari. @pmusaraj@merefield I’d be curious to know if you can reproduce on those browsers on the iPad (I couldn’t). That way at least we might get access to a console error.
Sorry for the delay, Nacho. I just tried this out and I can’t figure it out. There are no errors in the webview console. There is an error in the device console but it’s there whether the audio plays or not (FWIW the error is Required client entitlement is missing.