Rimuovere ruoli su risorsa storage account azure

@Giorgio Rillosi Firstly, apologies for the delay in responding here and any inconvenience this issue may have caused.
We cannot completely understand your question as this is an English global support. It would be helpful, if you can translate your question in English.Or you can consider support in other languages from here: https://azure.microsoft.com/support/options/

Refer the FAQ here: For which languages does Microsoft provide support?

After translating your question, "Remove roles on azure storage account resource. The system no longer allows me to remove storage account IAM session roles, even if they are not children. Any suggestions?
Thanks in advance to everyone"

I would recommend to refer this article which will help you in Add or remove Azure role assignments using Azure portal.

Also, Please refer to this MSDN thread for complete detailed information on how RBAC works and it's feature,
Hope this helps!

Kindly let us know if the above helps or you need further assistance on this issue.

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Thanks Sumarigo,

I've solved the problem. I have seen a lock in resources group.

Thanks everyone