I have a problem, when putting a Prestashop, which is in maintenance mode, in CloudFlare …
I already have several in CloudFlare, but one in particular, which is in maintenance mode, after putting it in CloudFlare, both the Front and the Admin, it only returns the error in the Too Many Redirections browser.
You didn’t say what the domain is, and without seeing the actual redirects, we can’t diagnose. A curl -I command to your website should show the Redirect location.