On my test server, every installed extensions are not listing in admin panel under Stores > Settings > Configuration > Advanced > Advanced.
And if the extension has configuration parameters
vendorName/moduleName/etc/adminhtml/system.xml, module configuration tab is not visible under Stores > Settings > Configuration
php bin/magento module:status the modules are listing and they are enabled.
Checking in the database (
setup_module table) the modules are listing.
app/etc/config.xml the modules are listing and set to '1'.
On my local machine, all works fine so it must be a server issue (permissions ???).
I don't understand what is the problem.