sendy 404 error htaccess php

Hello,

I purchased Sendy today and installed it following this guide https://www.wpmaximum.com/install-sendy-on-digitalocean/

I installed it with digital ocean on this domain: emailsversturen.jajomedia.nl

But now if I go to emailsversturen.jajomedia.nl I get a 404 error

It only works if I put emailsversturen.jajomedia.nl.php But than every time If have to put php after every new page I go to.

I changed the .htaccess but it didn’t work I also changed ensure AllowOverride Non to AllowOverride All But still it doesn’t work.

I am I doing something wrong?

regards,

Jan Gerards