Can't put any website into iframe

if i not mistaken, i usually making hype website with iframe, (in 2017ish) i put some contact form, google drive folder, or even wix page into iframe. but i can't do that now.
why only few website can show using iframe now (oct 2020) ..?
am i miss something?

i want to put these google sites into iframe as "news section" so my friend can easily update it.

The issue will likely be that google does not allow for the site to be loaded in an iframe.
many sites do this to stop misrepresentation etc.


What @MarkHunte said is correct; please see that the web developer console will log an error like:

Refused to load because it does not appear in the frame-ancestors directive of the Content Security Policy.

Beyond your specific needs, this is a common problem since the first "test" site most people use for iframes is :stuck_out_tongue_closed_eyes:.