UserDelegationKey
A user delegation key. 
                
The date-time the key expires.
            
The Azure Active Directory object ID in GUID format.
            
Abbreviation of the Azure Storage service that accepts the key.
            
The date-time the key is active.
            
The Azure Active Directory tenant ID in GUID format.
            
The service version that created the key.
            
The key as a base64 string.