Solved
Can you enable members to edit their user ID?
I’m running into a fair about of support tickets for changing user IDs.
Can I configure it for someone to update on their own?
Howdy!
It sounds like there’s an idea open for this one, that’s already attracting a few votes:
It would be nice to allow users to do this themselves, so it might be one to vote for. 
Bug blasting absolutely everything... The Blastoise Way