iframes will not show

I can only seem to find solutions that will work for a 7.0 install - Please help

How are you adding them ?

I can add iframes without issue using the page builder > html block > 'insert / edit embedded media' option ...

just select that option >> in the drop down select 'iframe' >> insert link >> save

OK, let's keep the conversation to this topic.

Where are you wanting to add them?  There are two places that might strip out the iframe code, one is the TinyMCE editor and the other one is the htmlpurifier.  The reason is to help keep out malicious code from the site as iframes can pose a security risk.

Where will dictate the how.