Unrecognized school for student discount on Apple Music

I am starting my studies in Landscape Gardening i a few days, and wanted to change my subscription to “student”. But the form says the school is unrecognized, and asked me to fill a request form for school eligibility at SheerID - only to get this message?

i have written SheerID support , but I am still wondering: I attended the school briefly in January, and there was no problem with changing subscriptions. But back then, Apple used Unidays (which still works and I can authorize via my student ID). So why the change, and why is my school suddenly not on the list?

@Apple

[Edited by Moderator]

Original Title: Student discount for AppleMusic