Hi @EDJ23,
Could you please share a screenshot of your flow's configuration?
Do you want to embed the iframe within your email?
Further, could you please show a bit more about your issue?
Thanks for your feedback, I have made a test and the issue is confirmed on my side. I afraid that embedding iframe within a email sent via the "Send an email" action is not supported in Microsoft Flow currently.
If you would like this feature to be added in Microsoft Flow, please submit an idea to Flow Ideas Forum:
https://powerusers.microsoft.com/t5/Flow-Ideas/idb-p/FlowIdeas
Best regards,
Kris