Continue to receive Oembed error on form in wordpress website

I send a test submission to your form and I was not able to replicate the problem. Here's a screenshot after clicking the submit button:

If you want to embed the form to your website, please try using iFrame method: https://www.jotform.com/help/148-Getting-the-form-iFrame-code

Hope that helps. Let us know if you need further assistance. Thank you.

This is because I removed the embed in HTML and created a button to link to
the form. Originally, I had the form embedded in my WordPress site and Wix
site. I removed it from those sites. The embed still doesn't work.
...

I checked your website page and indeed the form was not embedded anymore. I do see the button/link only of the Registration form.

 

Please try also re-embedding your form https://www.jotform.us/form/63275774227160 again on your website using instead its iframe publish code.

User guide: Getting-the-form-iFrame-code

You can try again the form when published using its iframe code.

Hope this help. Let us know if there is more we can assist you with.

Thanks.