User name worng way designed

I found all username created firstnameLastname
Not like this

This is going to be any issue, if yes what are they.What is the best way to do that
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It's not a technical problem in and of itself. Issues might arise if you have 2 people with the same first and last name (but that's no worse than if you had the '.' in their usernames). And that's where naming conventions with conflict resolution come into play.

From what you're mentioning, there's nothing to correct because firstnameLastname seem's to be the organization's convention. There's nothing wrong with that, provided there is conflict resolution and consistency. If you decide to change the convention, then you also have to be sure to keep the existing addresses as alaiases so that people on the outside can still reach your user base.

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