Perch Blog Pages Not Displaying

Hi, I have installed Perch and Perch Blog on 1&1 Hosting. I have added 3 posts and published. When I click 'View Post' on the Post page (URL https://s757033727.websitehome.co.uk/blog/post.php?s=2018-10-23-generic-post) I'm redirected to a "Page Not Found" error page. This is something I haven't experienced before as the post always displays okay on previous installs.

Is there any immediate light anyone can shed as to why this might occur?

Many thanks

Perch: 3.1.2, PHP: 7.2.10, MySQL: mysqlnd 5.0.12-dev - 20150407 - $Id: 38fea24f2847fa7519001be390c98ae0acafe387 $, with PDO
Server OS: Linux, cgi-fcgi
Installed apps: content (3.1.2), assets (3.1.2), categories (3.1.2), perch_blog (5.6.1)
App runtimes: <?php $apps_list = [ 'perch_blog' ];
PERCH_LOGINPATH: /perch
PERCH_PATH: /homepages/22/d757033722/htdocs/perch
PERCH_CORE: /homepages/22/d757033722/htdocs/perch/core
PERCH_RESFILEPATH: /homepages/22/d757033722/htdocs/perch/resources
Image manipulation: GD
PHP limits: Max upload 64M, Max POST 64M, Memory: -9.5367431640625E-7M, Total max file upload: -9.5367431640625E-7M
F1: 3b606135b33e6a102526838f4152a807
Resource folder writeable: Yes
HTTP_HOST: s757033727.websitehome.co.uk
DOCUMENT_ROOT: /kunden/homepages/22/d757033722/htdocs
REQUEST_URI: /perch/core/settings/diagnostics/
SCRIPT_NAME: /perch/core/settings/diagnostics/index.php