Web Content Widget rejecting iframe

Using the Web Content Widget, we are trying to embed a video player using a valid iframe tag but received an error saying:
"We couldn't find any embeddable content from this link. Please check the link and try again."
I tried testing the iframe on a regular web page and everything is working as expected.
Are there any pre-requisites that I may have missed in adding iframes of video players?
The iframe tag being used is formatted as follows:
<iframe class="iframe" width="800" scrolling="no" height="450" frameborder="0" marginwidth="0" allowfullscreen="allowfullscreen" marginheight="0" src={{actual source here}}></iframe>
Thank you,
Answers
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Hi @JohnEC
It sounds like this video player may not be one of the current approved domains for embedded content. You can see the list here: Embed Enabled Web Content
If your content is not in this list, you may want to add it as a Shortcut Widget instead.
Cheers,
Genevieve
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@Genevieve P. thanks for clarifying