Thanks - but that part I know. My question was not specific enough on second read. My issue is not getting the embed code, but using it here for the report gallery. This forum seems to strip it out.
@Sandy this is the same problem I have previously shared with you. For everyone else, this is not a problem with embedding the I frame, it is a broader problem with the html editor on the entire site. If you want to demo it, open the html editor and type something like <h1>Hello</h1> and try to save. You will get the same error.
Sorry everyone - we discovered that in allowing the 'iframe' it opens up too much security risk, so we had to turn it off. Please, instead, provide a link to the report. This also solves an additional issue, as when it's embedded, sometimes the spacing and such is not right and gives a bad impression of the report.
What I suggest for showcase - is to provide the http: link provided when you publish your report; as well as a screenshot for the showcase view.