docs/data/reusables/enterprise_management_console/username_normalization_sample.md

This table gives examples of how usernames are normalized in {% data variables.product.prodname_ghe_server %}:

Username	Normalized username	Result
Ms.Bubbles	ms-bubbles	This username is created successfully.
!Ms.Bubbles	-ms-bubbles	This username is not created, because it starts with a dash.
Ms.Bubbles!	ms-bubbles-	This username is not created, because it ends with a dash.
Ms!!Bubbles	ms--bubbles	This username is not created, because it contains two consecutive dashes.
Ms!Bubbles	ms-bubbles	This username is not created. Although the normalized username is valid, it already exists.
Ms.Bubbles@example.com	ms-bubbles	This username is not created. Although the normalized username is valid, it already exists.