@itari Thank you for reaching out to us!
As per troubleshooting guide - https://learn.microsoft.com/en-us/azure/cost-management-billing/manage/no-subscriptions-found#:~:text=Scenario%201%3A%20Error%20message%20is,Owner%20role%20to%20your%20account this issue usually occurs when you select incorrect directory. However, you already tried switching directory and it din't help, So, I could be a permission issue. You may want to check with your college/university admin to ensure you've appropriate permission.
Last option: Contact Azure subscription management team by raising a support request. Here is the link - https://learn.microsoft.com/en-us/azure/azure-portal/supportability/how-to-create-azure-support-request to create support case.
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