Embedding a PowerBI App in a web page?

And I would add:

This site talks about embedding the app (particularly the "for your organization" section):

Power BI embedded analytics overview - Power BI | Microsoft Learn

This is not embedding via iframe.  This is integrating the REST / OAUTH framework into your application.  Which we can do (had planned to) just were wanting a quick and dirty to get us going immediately.

And this:

Power Apps appears that you could do it.  This URL explains: Embed PowerApps in Power BI dashboards or your website | Microsoft Power Apps

Is specifically for Power Apps.  I have not tested it, but because the url for that iframe includes Power.Apps as the destination, I am uncertain a PBI app would render unless PBI is creating a Power App behind the scenes when you create an Organizational App for your workspace.

So, all suggestions still leave you unable to just embed the workspace app as an iframe.  At this time, I do not think this is possible, but hopefully MS PBI will add it down the road.