Hi Amanda,
I test with your embed code in SharePoint page embed webpart, it is working expectedly. Although I have no permission to access your form, but you can see the result below:
If you don't mind, you can also test my form embed code on your website to see the result.
<iframe width="640px" height= "480px" src= "https://forms.office.com/Pages/ResponsePage.aspx?id=v4j5cvGGr0GRqy180BHbR1jJlb6ncTFKuY9PnmRkJcZUQ0ZTREEwSFFPWjZaNjVaSVY5WVUwQzZOWS4u&embed=true" frameborder= "0" marginwidth= "0" marginheight= "0" style= "border: none; max-width:100%; max-height:100vh" allowfullscreen webkitallowfullscreen mozallowfullscreen msallowfullscreen> </iframe>
Based on the test result above, I assume the embed code is ok. The possible cause maybe the browser issue or website issue. To troubleshoot that, you can use try to embed on a SharePoint page to see the result. For your reference: Add content to your page using the Embed web part.
- If the issue can be reproduced in SharePoint page, you can change another browser to see the result.
- If the issue doesn’t happen in SharePoint Online page, can you tell me what website page you are trying to embed to?
Any updates please feel free to post back, we will help you as far as we can.
Regards,
Rena