Page de-indexed from Google after Cloudflare implementation

What is the name of the domain?

What is the issue you’re encountering

My client has a problem with the indexation of the homepage and all other subpages in Google from the teach24.eu domain. After implementing Cloudflare on the site, the pages have been indexed out of Google and I have no idea why. I have read on the internet about similar problems and it may have to do with Cache or it may interfere with other Wordpress plugins such as WP Rocket - the client uses it. The client also has several other domains that have the same problem after switching to Cloudflare. Does anyone have any ideas on how to solve this problem? Below are the results of the Googlebot test.

Screenshot of the error

Here is the ss from Google Search Console: https://imgur.com/a/MhYFuzR I’ve checked some subpages.