For route "/saveTheCookie" my browser had an error that the page couldn't be found.
So I changed the line in \resources\views\vendor\eu-cookie-consent\popup.blade.php:
<form action="{{ config('eu-cookie-consent.route') }}" method="POST">
into
<form action="{{ url(config('eu-cookie-consent.route')) }}" method="POST">
For route "/saveTheCookie" my browser had an error that the page couldn't be found.
So I changed the line in \resources\views\vendor\eu-cookie-consent\popup.blade.php:
<form action="{{ config('eu-cookie-consent.route') }}" method="POST">
into
<form action="{{ url(config('eu-cookie-consent.route')) }}" method="POST">
Now it works.