Vimeo onebox not working

Vimeo and YouTube oneboxing works here on meta and on my v2.3.0.beta3 +20 instance. The first troubleshooting step would be to figure out what is different in your instance.

  • What is your Discourse version?
  • Did you use the standard install?
  • Does it work in safe mode?
  • Do you have any customizations?
  • CDN?