Apache removed the Authorization Header, and there is no solution in $_SERVER.

You can try to add the following content in .htaccess, and it will be normal.

RewriteEngine On
RewriteCond %{HTTP:Authorization} ^(.*)
RewriteRule .* - [e=HTTP_AUTHORIZATION:%1]

In this way, you can use pure PHP to get the token in the header of the request.

<?php
echo $_SERVER['HTTP_AUTHORIZATION'];