fix(identity): check for bad chars in user names

[hgw77]

Summary

• this will handle bad chars that will break the backend call in usernames

Screenshots (if applicable)

Checklist

• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• I have made corresponding changes to the documentation (if applicable).
• My changes generate no new warnings or errors.

[ArtieReus]

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