CodePen in the Three.js forum is no longer working:
What config setting could have changed that disables CodePen embeds?
Check your allowed_iframes site setting and make sure the CodePen embed URL pattern is listed there.
Also verify that allowed_onebox_iframes isn’t too restrictive.
Finally, confirm that codepen.io isn’t included in blocked_onebox_domains.
The CodePen entry in allowed_iframes was changed a few months ago in Security fixes for main by tgxworld · Pull Request #33117 · discourse/discourse · GitHub
Maybe your links don’t match the new allowed format.
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