This assumes that the elastic instance is created in Azure.
Step 1 - Elastic Cloud Dashboard
Click on the deployment that you made
Step 2 - Select on "Security"
Step 3 - Click on "Add Settings"
Step 4 - Add the secret information
Type set to Single string, add the following keys and their values:
azure.client.secondary.account(Name of storage account)
azure.client.secondary.key(One of the keys that you saved from part 1)