OK, here is the response from Royal about not being able to submit the Special Needs form :
In the meantime, you may email us at special_needs@rccl.com and kindly send your booking details, the name of the guest who will be needing the accommodations, and the list of accommodations so we can note the reservation. There's no need to fill out the form. Just compose an email with above details and please send it to the email address above.