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Could you please let us know the following information, so that we can take a closer look at what seems to be wrong, as so that we may try and find solutions to the problem that you are experiencing.
1. Direct link to the Facebook page which shows this error.
2. Which of your forms have you tried to embed?
You can also try re-embedding your desired form into your Facebook page by following this guide: Adding-Form-to-Facebook-Pages
We will await for your response, thank you.