500 Internal Server Error on Web Server for subpages

I've just uploaded my site to Ionos, but every page that isn't the home page (e.g. www.mywebsite.com/page) gives a 500 Internal Server Error.

I am using the ddefault .htaccess that came with CodeIgniter 4.

If I go to www.mywebsite.com/index.php/page, the page loads fine.

Has anybody else had this issue, or could help? I've been stuck for hours