Hi @Marco
Thank you for reaching out.
Could you please check if any subscription is still showing at https://admin.microsoft.com/Adminportal/Home#/subscriptions
If there are any subscriptions, please cancel and delete those subscriptions. Once the subscriptions are deleted, it can take around 48-72 hours to reflect in Azure AD portal.
If you're still running into issues after following the "delete" documentation, I'd recommend creating a support request for this issue since our support team can look further into your tenant.
Reference: https://learn.microsoft.com/en-us/entra/identity/users/directory-delete-howto
https://learn.microsoft.com/en-us/answers/questions/395959/cant-delete-tenant-delete-all-license-based-subscr?orderBy=Helpful
Hope this helps. Do let us know if you any further queries.
Thanks,
Akhilesh.
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