Hi Viktoria,
Welcome to Microsoft Q&A community forum!
If you are unable to access/sign up to Azure for students, you can sign up for Azure free trial.
https://azure.microsoft.com/en-us/free/free-account-students-faq/
or try the steps in the below links
https://learn.microsoft.com/en-us/azure/cost-management-billing/manage/troubleshoot-azure-sign-up
https://azure.microsoft.com/en-us/free/students/
https://www.youtube.com/watch?v=ccecINeR16Y
Hope this helps
Cheers
Luca