or use this example XOG to build a one off loader, or a maintenance process to keep it correct.
i.e. loop this for each user to update (keep in mind batching options)
I've left some other useful parts in the XOG such as userTimezone and homeUrl
<?xml version="1.0" encoding="UTF-8"?>
<NikuDataBus xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../xsd/nikuxog_user.xsd">
<Header action="write" externalSource="NIKU" objectType="user" version="13.3.0.286"/>
<Users>
<User externalId=" " userLanguage="English" userLocale="en_GB" userName="user_name_here"
userTimezone="Europe/London" >
<PersonalInformation emailAddress="email_address_here" firstName="first_name_here" lastName="last_name_here" homeUrl="url_to_set_here"/>
</User>
</Users>
</NikuDataBus>