There's a lot of things that has changed with the new servers. For one you would automatically have been put on php version 7.2 with a default set of features.
You can change version (and features) under "Extra Features->Select PHP version". For that to work you would need to check that allow_url_fopen is enabled (if I'm not all mistaken as to what it needs), you find that under the "Switch to PHP options" link. Note though with the Native version you can not make any changes, you need to chose anyone of the other versions.