How can I preview/edit/check installation in Google Optimize without receiving the error: 'This site can’t be reached.'

Question

PROBLEM

When I click on any of the following buttons:

• Check Installation
• Preview--> web preview
• Edit

I receive the error: 'This site can’t be reached. Check if there is a typo in www.googleoptimize.com.'

THINGS I HAVE TRIED

• cleared cookies
• set cookies to accept all
• Tried different CMS's, e.g. carrd.co and squarespace

MY SETUP

The website header has the following embedded:

• Optimize.js snippet
• Google Tag snippet
• Anti flicker snippet
• Google chrome extension
• Optimize snippet

Answer 1

Changing the DNS address to 1.1.1.1 seems to have resolved the issue.

Instructions on how to do this can be found here: https://kinsta.com/knowledgebase/dns_probe_finished_nxdomain/