Hi,
How is it connected is it via Expressroute or via Internet? Check local policies on Onpremise firewall whether you are allowed and also for Blob Storage if any changes on the networking to accept connections is from Enabled from selected virtual networks and IP addresses or Disabled?
https://learn.microsoft.com/en-us/azure/storage/common/storage-network-security?tabs=azure-portal
Hope this helps.
JS
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