How to share a report using Secure Embed option (I frames) with External users outside my company?

Hi. Let me clarify two ways of embeding in secure way because you are confusing them.

- Embed by secure ifram: This method will create a link to easy integrate with a web app. The method will require a Microsoft profesional account with Power Bi Pro licence in the same tenant.

- Power Bi Embed Capacity: this method will need a payment for a capacity that allows deep coding to Power Bi Service components. This method will also let you own the security and login. That way you can distribute the web app across a lot of external people without pro licence.

You might want to use the second one if you want to share with that many users. Otherwise it would be a lot more expensive to pay for externals pro users.

Hope this helps,