Hello Gs9511,
Thanks for asking the Apple Support Communities for help with Apple Music Student subscription.
When you join Apple Music as a student, UNiDAYS verifies your information. Get an Apple Music student subscription - Apple Support
"When you join Apple Music as a student, UNiDAYS, a student validation service, confirms that you're enrolled in a degree-granting university or college. After UNiDAYS verifies that you're a student, then you can get a student subscription to Apple Music."
You can verify this using your iPhone: "Verify your student status
Near the end of each year that you have an Apple Music student subscription, you'll see a message that asks you to verify your student status in the Music app or iTunes for Windows. You can also verify your student status at any time using your iPhone, iPad, or iPod touch."
"In Settings on your iPhone, iPad, or iPod touch
- Go to Settings > [your name], then tap Subscriptions.
- Tap Apple Music Membership.
- Tap Verify your student status. You'll be redirected to the UNiDAYS website.
- Follow the prompts to verify your eligibility. If the verification is successful, you'll automatically return to Apple Music and continue your Apple Music student subscription."
If you still have issues, it's possible the issue is cause by the network you are connected to. Try while connected to a different wireless network. You can also try by turning off Wi-Fi and testing only with your cellular connection (if possible.)
To try with another wireless network, make sure it meets these requirements: Recommended settings for Wi-Fi routers and access points - Apple Support
To turn Wi-Fi off and use your cellular connection, go to Settings > Wi-Fi, and turn the slider off. Be aware that this will use your cellular data until you turn Wi-Fi back on. (iOS with cellular data only)
Thanks and have a wonderful day.