# Username\_no\_double\_special Any reason to enforce it?

**URL:** <https://meta.discourse.org/t/username-no-double-special-any-reason-to-enforce-it/51644>\
**Category:** Development\
**Created:** [10월 17, 2016, 2:50오후 UTC](https://meta.discourse.org/t/username-no-double-special-any-reason-to-enforce-it/51644 "2016-10-17T14:50:06Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![Falco](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/falco/32/179432_2.png) [@Falco](https://meta.discourse.org/u/Falco)\
**Post date:** [10월 18, 2016, 11:11오후 UTC](https://meta.discourse.org/t/username-no-double-special-any-reason-to-enforce-it/51644/5 "2016-10-18T23:11:43Z")

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We also store `external_id` for SSO logins, that may help you.

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_[View the full topic](https://meta.discourse.org/t/username-no-double-special-any-reason-to-enforce-it/51644)._