@Jagadish Kannan
Can you share the screenshot of the error message? What kind of SAS token permission?
Can you try to provide SAS permission using Azure Storage Explorer ?
You can use shared access signatures (SAS) to generate tokens that have specific permissions, and which are valid for a specified time interval. For example, you can generate a token with read-only access to a specific file that has a 10-minute expiry. Anyone who possesses the token while the token is valid has read-only access to that file for those 10 minutes. Shared access signature keys are supported only via the REST API or in client libraries. You must mount the Azure file share over SMB by using the storage account keys.