Hello MeekyKHM,
First, make sure that you still qualify for the Apple Music student subscription. According to Apple, you can get Apple Music at a discounted monthly rate for up to 48 months. You can see this information and more here: Get an Apple Music student subscription - Apple Support. Is your Apple Music student subscription still active? Keep in mind that it looks like you may have to reverify your student status.
Also, pay close attention to the information offered here, which does mention cases where the Apple TV+ subscription will be removed:
If you're no longer a student
If you're no longer a student or if you complete 48 months of a student subscription, your subscription automatically becomes an Apple Music individual subscription and you lose free access to Apple TV+.
If you're prompted to verify your student status after launching Apple Music, but you're no longer a student or have completed 48 months of a subscription, tap or click "I'm No Longer A Student." You won't be asked to verify again.
If you don’t confirm during the verification period, and you still have time left in your 48 months, you'll have to re-enroll as a student.
We hope this information helps you out.
Kind regards!