When creating a profile in the job portal, you may be asked to verify your profile. Either by UNI-login, school email or the like.
When entering your UNI-login, make sure there are no spaces in the field, only your login.
If your verification code won't be accepted, it's most likely due to the fact that you've created a profile before and used the code. If that's not the case, please contact firstname.lastname@example.org for help.