Different blocks require different fixes. The most common reasons are:
Family Link or browser-level restrictions may limit access to specific content. unblock a website in chrome
Here are the methods to unblock a site, ordered from the easiest fixes to more advanced workarounds. Different blocks require different fixes
If you are seeing a "This site can’t be reached" or "Your connection is not private" error, Chrome might be holding onto old data that is conflicting with the site. unblock a website in chrome