My application was considered non-eligible because of language proficiency, but I hold a IELTS/TOEFL/... certificate!
In the application form you are asked to provide proof of your English qualifications. If you state you hold and internationally recognized certificate you must upload a copy of it. If you did not upload a copy of your certificate your application was excluded.
Search the lists for both your first name and for your family name.
If your name cannot be found in any of these lists you probably did not submit your online application. Your application is only considered valid when you push the "submit" button in the application form.