A list of service principal names (SPNs) associated with the service principal. An SPN must be unique per company tenant ...

Azure Active Directory

              A list of service principal names (SPNs) associated with the service principal.
              An SPN must be unique per company tenant and is used by an application to uniquely identify itself.  By default the service principal AppID is always added as an SPN.
              An SPN must use one of the following formats "appName" or "appName/hostname" or be a valid URL.  AppName represents the name of the application and hostname represents the URI authority for the application.  When the service principal represents a WS-Federation relying party, an SPN can be set to a URL that would be treated as the WS-Federation wtrealm parameter.

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