Hi @Michał Mółka · 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.
-----------------------------------------------------------------------------------------------------------
Please "Accept the answer" if the information helped you. This will help us and others in the community as well.