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I checked your last modified form and I cloned it to my side. When I tried to embed the form to my Facebook Page, I was not able to reproduce the issue.
You can see the embedded form in Facebook in the video below.
Could you please provide the error message that you get when you try to embed your form to Facebook?
Note that if you already embedded a form to your Facebook Page, you cannot embedded another form to the same Facebook Page.
In addition, please have a look at this guide to learn how to embed a form to your Facebook Page: Adding a Form to Your Facebook Page
I'll be awaiting for your reply.