Create user using user_name or email in WSO2 Idenity Server

Prerequisites:-
WSO2 Identity Server 5.0.0 or above

WSO2 Identity Server you can authenticate using user_name or email. By default authenticate using user_name.

For that , you need to uncomment the EnableEmailUserName in carbon.xml file  [IS_HOME]/repository/conf/ directory as below.

    <!-- Enable following config to allow Emails as usernames. -->
    <EnableEmailUserName>true</EnableEmailUserName>

After you need to do the below changes as well,

1. Add new property in to the [IS_HOME]/repository/conf/user-mgt.xml file as below,

   <Property name="UsernameWithEmailJavaScriptRegEx">[a-zA-Z0-9@._-|//]{3,30}$</Property>

2. Do the below changes in user-mgt.xml file as well,<Property name="UsernameJavaRegEx">[a-zA-Z0-9@._-|//]{3,30}$</Property>
<Property name="UsernameJavaScriptRegEx">[a-zA-Z0-9._-|//]{3,30}$</Property>

After that you can create user using UserName or Email and login as well.
In additionally tenant creation use case, you need to create tenant admin with only email user_name. After that you can create users as your desire.