net::ERR_CERT_AUTHORITY_INVALID on iframe

I am having trouble to open up the same page on iframe

Let's say the page is https://www.anypage.com I get the following error

I can proceed to the page by typing thisisunsafe and the page will open

Inside the page, I have an iframe that will open the same page https://www.anypage.com but since the page gets the ERR_CERT_AUTHORITY_INVALID, it did on iframe as well

Anyone ever encounter this problem before? I have no experience on security-related, sorry for the ignorance