When you're a student at SDU, you have a SDU-mail that you is used for logging into sso.sdu.dk, Exam Monitor, etc. Your SDU-mail can't be used when you set up your Apple-ID. Be aware of that your SDU-mail will be deleted 90 days after finish your studies at SDU.
If you want have your SDU-mail on your Smartphone in order to check your mails easily from SDU, then please tag along.
Guide for iPhone or iPad
You can find the guide here.
Guide for Android
You can find the guide here.