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 

Try to edit your /public/.htaccess and add a question mark. Some servers don't do rewrite without it.

Code:

RewriteRule ^(.*)$ index.php?/$1 [L]

or

Code:

RewriteRule ^(.*)$ index.php?/$1 [L,QSA]

Try to edit your /public/.htaccess and add a question mark. Some servers don't do rewrite without it.

Code:

RewriteRule ^(.*)$ index.php?/$1 [L]

or

Code:

RewriteRule ^(.*)$ index.php?/$1 [L,QSA]

Thank you jreklund!!! By itself, adding the question mark didn't work, but I tried enabling the RewriteBase / line and hey presto! IT WORKED!
Thanks a million.