LiveJournal has updated its post editor and they’re restricting direct embeds on their platform. Read More here https://www.livejournal.com/support/faq/14.html. We suggest adding the form link on the post instead.
In order to add your form to a LiveJournal Post:
1. On the Form Editor, click the “Publish” button.
2. Go to the “Embed” section and then click the “Source Code” option.
3. Click the “Copy Code” button to copy the source code.
4. On the LiveJournal “Post New Entry“, click the “HTML” then paste the code on the editor. After that, just click “Post” button.