Thank you for posting your query on Microsoft Q&A.
The roles you have assigned already are Azure AD roles i.e Global Administrator. But the roles required to access Azure Resources are slightly different. We have a comparison here - https://learn.microsoft.com/en-us/azure/role-based-access-control/rbac-and-directory-admin-roles#differences-between-azure-roles-and-azure-ad-roles
To provide roles which grant access to Azure Resources you would do this at the subscription level. First navigate to the subscription you wish to assign the user access too, then click on "Access Control" - +Add
You can grant the user an RBAC role from here which will allow them to access the Storage accounts etc..
For reference here is a list of the possible roles you can grant -https://learn.microsoft.com/en-us/azure/role-based-access-control/built-in-roles
Let me know if you have any further queries and I would be happy to help.
Kind Regards,
Donal