@Claudio welcome to the Microsoft Q&A community.
Based on similar cases, this issue seems to be a synchronization problem between the Azure Sponsorship Portal and the Founders Hub
Here are a few steps you can try:
Check Activation Status – Ensure that your credits were properly activated in the Founders Hub. Sometimes, incomplete activation can cause discrepancies.
Verify Account Access – Make sure you're signed in with the correct Azure Sponsorship account that is linked to your Founders Hub.
Wait for Sync – Some users have reported that the balance updates after a delay, though this isn't ideal.
Submit a Support Request – If you haven't already, try submitting a ticket through the Azure Support Portal or the Founders Hub Support. Even if responses have been slow, persistence might help.
If the issue persists, you might want to escalate it through Microsoft’s official support channels or community forums.
I hope these helps. Let me know if you have any further questions or need additional assistance.
Also if these answers your query, do click the "Upvote" and click "Accept the answer" of which might be beneficial to other community members reading this thread.