Training: Instruction to develop new skills.
I think Azure for Students only works when Microsoft already recognizes the school’s mail domain as an academic tenant, and there’s no self‑service way for students to change that.
If “domain not registered” shows up and there’s no alternate verification, you just open Help and support → Account and billing → Education and ask Microsoft to review the domain, and your school’s IT/admin needs to request the domain onboarding.