Hi David,
Not being able to access data from the portal is normal when you have your storage account configured to only allow access via Private Endpoint.
In order to access the data in your storage account you need to access it via the Virtual Network that has access to your Private Endpoint. For example, you could have a VM on the Virtual Network, connect to this VM using Azure Bastion (or other method), and then connect to the storage account to access blobs.
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Thanks.
-TP