Help with Embed: Unable to post message to [discourse]. Receipient has origin [mydomain]

That is the exact bug we have, and it happens due to a quirky on the browsers about how they handle a refresh in an iFrame using the a tag in the head, which we had to introduce in Extract inline JS on embedded comments by xrav3nz · Pull Request #6645 · discourse/discourse · GitHub to enable CSP.

So the first person to visit a blog post with comments will have to refresh it to see the embed, all subsequent visits will work. We have a proposed fix already and will merge it in a few weeks.

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