Ack, thank you.
I was trying to onebox a video from Peertube. It used to work just by pasting the link, and I do have the correct allowed_iframes entry. I’m a bit lost with recent changes with CSP that seem to break on new instances but not old ones.
Like, this link https://peertube.public.cat/videos/watch/392c393e-1fde-4356-bb25-8a92e7ce2057 used to show a video…
https://peertube.public.cat/videos/watch/392c393e-1fde-4356-bb25-8a92e7ce2057