リンクが展開されない

[JammyDodger]

There’s this from the Onebox guide:

@sam

Troubleshooting

If Onebox is not working as expected, please check the following:

• Test your site by pasting the link into iFramely ; check that the target is using correct OpenGraph or oEmbed meta tags for content. And remember the description text is required in Discourse!
• Verify that the onebox request to the target website has not been blocked by user-agent . Some WordPress hosts frequently block “unknown” user agents.

There may be a couple of other bits in there that might provide some inspiration too? I hope you figure it out.