How to get Unity Analytics unique user ID?

So far, I understand that Unity Analytics creates a new unique user ID every time my app is downloaded.

There is a SetUserID function in the Analytics API:

However, how do I get the unique user ID that Unity has generated? There is no corresponding GetUserID function.


AnalyticsSessionInfo.userId - UserId is random GUID to track a player and is persisted across game session

On the other hand use for unique install;