How to whitelist iframe from Kotlin playground?

This is what i want to embed: Kotlin Playground: Edit, Run, Share Kotlin Code Online

This is the iframe url: <iframe src=""></iframe>

The same iframe url just to see if embed works on meta:

And this is where the URL above redirects me:

This is what i tried to add, but it doesn’t seem to work:

I have tried adding one or the other of the 2 kotlin links. i have also tried adding both.

hmm strange, I’m able to get it to work on my dev instance

Screen Shot 2022-04-11 at 8.43.14 PM

Screen Shot 2022-04-11 at 8.42.35 PM

are there any errors in the console when you’re trying to view the topic with the iframe?

it seems to be working today


so idk what might have happened.

Second question: is there a way to make that box more beautiful? it this something from the iframe, or something from discourse?