In the Administration side, Clarity Users are having the following attributes as IDs:
1. External ID - not mandatory; not unique
2. Username - Unique
3. Resource ID - Unique
We need to update the Usernames for existing users.
Tried XOGging in - if we keep the Resource ID tag and try to update the Username, it says 'Resource ID already present'. If we remove the Resource ID tag, it is creating a new user (!).