In the htaccess.txt of Joomla (which I renamed then to .htaccess...) is a little note which says I should uncomment the following line of code. Tested it uncommented and the other way. None of them worked.
Unfortunately I forgot to change the path of the component (add /Joomla before /component). No it works fine.
Sry for wasting your time.

Code:
RewriteCond %{REQUEST_URI} ^(/Joomla/component/option,com) [NC,OR] ##optional - see notes##
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