Google ads: Your website is unavailable

Hello. I am running Google Ads for one of my projects build on Webflow—
It was working for a while but now my campaign is stopped with following comments:
“Your website is unavailable. To turn ads back on, fix the issue with your website or send people to your Business Profile.”
After checking with Google support team, I’ve got the following response: “Our technical department has scanned your web-site and detected that this is not accessing globally. You can check in different platforms to ensure the landing page is globally accessible before appealing this label.”

Have no idea what to check and would appreciate any thoughts.

Here is my site Read-Only: LINK
(how to share your site Read-Only link)