Hello, I am having the exact same problem, and I have tried all of the suggestions, none if them worked. My discount will run out tomorrow, and I really do not want to pay the full price, as I am indeed a Student in Austria, and have gotten the discount for the previous semester. Please contact SheerID and tell them to solve this problem, especially since a lot of people are experiencing it.
It is not fair if people have to pay more because of technical issues.
Figured out a workaround. It seems like SheerID has changed the way their API works. The type "UNIVERSITY" no longer exists. Instead, it is now called "POST_SECONDARY" in many cases. You can verify this by using this url:
Thus, the engineers at Spotify or SheerID have to change the form accordingly.
To fix this yourself, right-click the University text field and click inspect or open Developer Tools. There, find the <input> with id "organizationId" and change data-org-type="UNIVERSITY" to data-org-type="POST_SECONDARY". Clicking the arrow should now get you search results for universities.
See the screenshot below for the attribute that has to be changed.