The PHP information in the control panel may be hard coded, and not actually reflect the information of your account. The most reliable way to know which PHP version you are on, and which extensions are enabled, is by creating a PHP info file on your own website and loading that:
It’s likely that you are on a PHP 8.1 server, which doesn’t have GD right now, in spite of the PHP info in the control panel saying something different.
I can assure you that this is 1) not possible here, or with any other hosting provider, and 2) we wouldn’t have a PHP 8.1 server running for months with missing extensions if it was as simple as enabling the extension in the PHP settings.