Clarification Needed: Education Project Blocked by Removal of Track Preview URLs for New Apps

[Tymeo]

Hello,

I am developing a student educational project using the Spotify Web API to explore user-music interaction and personalization. The concept is a blind-test quiz where users log in with OAuth and the app retrieves short preview audio clips from their library to generate learning and recognition questions. No full audio streaming, no storage, and no downloading.

Since the November 2024 API changes, the preview_url field and several data-based recommendation endpoints no longer work for new apps, even with user permission and tester access enabled. The result is that new educational projects using legal 30-second previews are unable to function at all. Some user accounts with large libraries return zero previews or empty responses.

I would like to clarify the official guidelines regarding the following points:

1. Can student or educational developers apply for extended access to preview URLs for learning purposes?
2. If not, is there any approved method to build blind-test or music-quiz features based on a user library without streaming or storing audio?
3. Is there a recommended alternative endpoint or future replacement for preview audio?
4. What is the recommended compliant approach for learning and experimenting with music-based interaction features under the current platform rules?

I fully respect licensing and want to ensure compliance. I am simply looking for the correct technical and legal path forward for educational development and experimentation.

Thank you for your guidance.