Student unable to purchase Apple Music student plan

Apple Music - Apple

"Is there an Apple Music student subscription?

Students get the same Apple Music features and benefits as individual members. Once your student status with your college or university is verified, you get student membership pricing for up to four years, as long as you remain a student. After four years, your membership will continue at the individual member price."

If you are a high school student, that could explain why you can't get the student subscription plan. If, on the other hand, you are a college student, you will need to contact Apple to find out what verification they require.

This is a user-to-user forum and we have no access to your student records or to Apple's records.