I just configured the paypal module and the payment is working. I also get the Payment successful status in the backend. So now i want to set the status to Send or any other and sometimes later i get the message: "Event notification has not been received yet. Please check if your website has a correct SSL certificate (https) or htaccess are not enabled."
After that i have no way of changing the status manually.
I have a working certificate and the server uses tls 1.2.
https://i.imgur.com/ELA8PCK.png
Also the default prestashop generated .htaccess is in use.
Any tips on how to debug the issue?