Community Nickname has to be unique across all users? or it has to be unique within a org? As far as I know, username has to be unique across all Salesforce users in the world. Any thoughts?

Attribution to: doga

Possible Suggestion/Solution #1

Within the org. That's what you're authenticating into.

Attribution to: Shane McLaughlin

Possible Suggestion/Solution #2

Yes your salesforce username has to be globally unique. I would think the Community Nickname is only unique across your org.

You might also want to review this thread Handling Community Nickname field for Customer Portal registration

Attribution to: techtrekker
This content is remixed from stackoverflow or stackexchange. Please visit https://salesforce.stackexchange.com/questions/3702