That is quite likely due to security settings in your web browser. Online forms use java script, XHR, and frames. I’ve run into this problem on various web sites because I have very tight security on my browser. Try temporarily loosening the settings on your browser, white-listing the site, or using another browser where you haven’t set security so tight. I use Vivaldi for this purpose and just installed on a thumb drive.
Here is my readout from the uMatrix AddOn in Firefox showing all the scripts and third party links for the Support page linked above. As expected they are fairly extensive:
