All of the default values for the RuntimeSettings.xml can be found in the C:\Program Files\Alteryx\bin\RuntimeData\RuntimeSettings.xml.
These values are overridden by the RuntimeSettings.xml file in the ProgramData folder. Unfortunately, there is no “formal” documentation right now.
The suggestion would be to show users the universe of XML tags and their corresponding accepted value configs, and other data related to the XML entity.
Element Name ServiceProviderEntityID -> child of Authentication -> grandchild of SystemSettings