403 after pointing A-Record of subdomain to IP of other server

I have two servers X and Y.

Server X:

I have a VHOST for the subdomain test.api.konfigurator.company.de pointing to a directory which simply has a index.html containing the word "it works!".

First I tested it locally, by editing my hosts file in windows. That worked, the text "it works!" is showing if I call test.api.konfigurator.company.de from the browser.

So this made sure that the VHOST works. I deleted the record from my "hosts" file again.

Server Y:

I created a subdomain test.api.konfigurator.company.de from cpanel.

The process of creating the subdomain also created the A-Records.

I added this additional A-Record to company.de:

test.api.konfigurator.company.de.   300    A    3.70.50.1XX

If I ping test.api.konfigurator.company.de then I get 3.70.50.1XX so that worked.

So everything should be ready.

Expected behaviour:

If I open https://test.api.konfigurator.company.de from the browser, then the content "it works!" should show.

Actual behaviour:

Forbidden You don't have permission to access this resource.

Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.

VHOST:

<VirtualHost *:80>
        ServerName test.api.konfigurator.company.de

        ServerAdmin webmaster@localhost
        DocumentRoot /var/www/company/test.api.konfigurator.company.de/public

        <Directory /var/www/company/test.api.konfigurator.company.de/public>
                Options Indexes FollowSymLinks
                AllowOverride All
        </Directory>

        ErrorLog ${APACHE_LOG_DIR}/api_company_konfigurator_error.log
        CustomLog ${APACHE_LOG_DIR}/api_company_konfigurator_access.log combined
</VirtualHost>

# vim: syntax=apache ts=4 sw=4 sts=4 sr noet