Advanced iframe debug console - l: local messages, r: remote messages
User agent: CCBot/2.0 (https://commoncrawl.org/faq/)

Headers of https://xn--bhler-verantwortung-59b.de/shop/index.php:
HTTP/2 200
date: Thu, 29 Jul 2021 22:43:37 GMT
server: Apache
x-powered-by: PHP/7.4.21
access-control-allow-origin: *
access-control-allow-methods: GET, POST
content-type: application/json;charset=utf-8

The page does exist and no X-Frame-Options header was found. But there can still be a iframe blocker script on this page. Go here for a full check.