Hello Phil,
Likely this is due to a browser security setting: if you are accessing a web-page via HTTPS, it is not possible to show HTTP content in an iframe.
In the browser’s console you should see a warning “MIXED-CONTENT” if this is what you are facing.
See for instance [1] for a bit of technical explanation.
As this is a browser feature, you need to avoid the MIXED-CONTENT in the first place (e.g. by accessing the iframe content via HTTPS).
Hope this helps,
Andreas
[1] https://developer.mozilla.org/en-US/docs/Web/Security/Mixed_content
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